TEO Work Zone Safety Committee Meeting - MnDOT...Issued on May 1, 2006 Page 1 of 4 TEO Work Zone...

Issued on May 1, 2006 of 4

TEO Work Zone Safety Committee Meeting April 19, 2006 Minutes

meeting was located in the Stearns County Public Works Building Committee Members Present: Ken Nelson, CO Maintenance Bill Servatius, CO Construction Craig Mittelstadt, CO Construction Jim Miles, District 1 Dave Buss, District 3 Oliver Kendall, District 4 Jeff Rieder, District 6 Ken Wenkel, District 7 Allan Rice, District 8 Mike Engh, Metro Sue Lorentz, Metro Jon Jackels, CO Traffic Marv Sohlo, CO Traffic

Guests Present: Jeff Perkins, D4 Construction Steve Kordosky, Metro Construction Ken Schroepfer, CO Traffic MMUTCD

Note: Committee members, please review the minutes and report corrections to Marv Sohlo Night Maintenance Previous Action Item: Sue Lorentz will lead the initial effort by meeting with night maintenance workers

and developing sketches of the various layouts used. Some of these will be based on recent efforts with Metro Traffic Engineering and CO Traffic Engineering. Sue will invite Marv Sohlo to these meetings. The final artwork for this section of the Field Manual will be developed by CO Traffic Engineering.

UPDATE: Sue, Mike Engh and Marv met to discuss the new night maintenance lane closure layout. The layout (Layout XX11) is included in the package of proposed layouts attached with this minutes. No further discussion was held on this layout at this time.

Warning Lights Previous Action Item: Marv Sohlo will make the appropriate changes to the Field Manual Layouts and

Part 6 MN MUTCD section(s). The change removes the reference to warning lights on signs and barricades unless the sign or barricade is warning a roadway closure (or ramp or sidewalk closure).

UPDATE: The distributed copy of the Field Manual with proposed changes marked, had all references to warning lights removed except for roadway closures.

Your Speed Is Signs Previous Action Item: Jeff Rieder will forward District 6 comments regarding this to Marv Sohlo. Marv

will coordinate incorporation of these comments into the tech memo with the TEO Signing Committee.

UPDATE: District Six’s comments were received and the Tech Memo Draft was prepared by Marv. A copy of the Draft Tech memo on dynamic speed display signs in work zones is attached for review.

Discussion: The committee reviewed draft layouts for the placement of the dynamic speed display signs in work zones and determined that the layouts should not be placed directly in the Field


Manual. It was agreed that the layouts were useful, but should be incorporated in to the Guideline for Establishing Speed Limits in Work Zones document. It was also agreed that the Guideline should be incorporated into the MN MUTCD. Two layouts for the draft tech memo for dynamic speed display signs in work zones will be forwarded to Daniel Brannan for review. The “dynamic speed display sign in work zones” draft tech memo will be sent to the committee for review (see attachment).

UPDATE: The draft Tech Memo was reviewed by Dan and he noticed a few things that needed re-wording immediately and these changed have been made on the attached file. He has reservations on whether the WZ Speed Limit Guideline should be included in the MN MUTCD, but he will be dealing with that issue and other needed updates to the guideline through his advisory committee (which includes members from Mn/DOT and from State Patrol).

ACTION ITEM: The draft Tech Memo will be presented to the MNMUTCD Committee and upon approvals, it will continue through the review process. The proposed layouts with the Tech Memo will become part of the WZ Speed Limit Guideline and will not be included in the Field Manual. Committee members should review the draft and submit comments to Marv ASAP.

Channelizing Devices Previous Discussion: It was agreed that spacing of channelizers in transition areas (tapers, shifts, etc.)

should be based on the posted speed limit before construction and the spacing of channelizers in tangent areas be based on the posted speed limit during construction. This change would have to be incorporated into the entire Part 6 and Field Manual.

Previous Action Item: Marv will research and make recommendations for corrections to the channelizer spacing shown on Tables 6F-3 and 6F-4 that are inconsistent with the text in Part 6 (i.e. change the table or change the text).

UPDATE: A revised Table 6F-3 “Recommended Application and Maximum Spacing of Channelizing Devices” and a revised Table 6F-4 “Recommended Spacing of Channelizing Devices” were prepared by Marv for review.

Table 6F-3 was expanded to include additional devices and to categorize the devices into the Type A, B and C designations. More notes were added to help the designer determine an appropriate device. The table is attached for further review and comments.

Table 6F-4 was not changed at this time. Discussion: The committee made some comments regarding the notes on Table 6F-3 for tubular

markers and weighted channelizers and felt that the term ‘inadequate space” needs to be defined.

ACTION ITEM: Jon will address the comments. See the included document from Jon regarding channelizing devices. Please review and comment on this document ASAP.

Field Manual – 2007 Update Previous Action Item: Marv Sohlo will incorporate the comments as listed below into the revisions of the

Field Manual. UPDATE: A copy of the Field Manual’s Proposed Changes was distributed prior to the meeting for

committee review. Not all previous comments were addressed at this time. The status of the changes are shown below:

• Action: Flashing Arrowboards will be required for all lane closures on high-speed multi-lane roadways.

Status: Will be incorporated as requested (will show in future Field Manual Proposed Change documents).

• Action: Various minor changes, typos and graphical errors were found through out the manual.


Status: Changes have been incorporated into the Field Manual Proposed Change document. A complete list of proposed changes was distributed to the committee and has been attached to these minutes.

• Action: Mobile Layouts should be added for shouldering operations, rumble strip installations, profilagraph, coring, maintenance of crosswalks (painting) and sweeping

Status: Some mobile operations have been developed and distributed to the committee. The remaining layouts have not been developed at this time.

Discussion: On March 30th, Jon, Ken Schroepfer and Marv met with representatives of Local

Government, who will become our Local Group for the update of the Field Manual. The Local Group suggested the inclusion of mowing operations (which may be utilized for most shouldering operations) and motor grader operations. The new draft layouts are included in the layout package document attached for review as Layouts XX6 (Off Roadway Work Space) and Layout XX8 (Gravel Road Maintenance). The Local Group also requested the addition of a layout for flagging on a short duration stationary operation on minor roadways near an intersection with a major roadway. During the TEO WZ committee meeting, Marv distributed a series of 4 layouts for this situation (for approaching the intersection, immediately before the intersection, immediately after the intersection and closely beyond the intersection), but the committee determined that the situation could be handled with one typical layout. The new draft layout is included with these minutes as Layout XX2 (Lane Closure on Minor Roadway near Intersection with Major Roadway). Included in the new layouts is Layout XX1 which is proposed for the Pilot Car Operations and it will also be included in the Flagging Manual. Layout XX11 is the new proposed layout for Nighttime Lane Closures on multi-lane roadways when workers are in the work zone (occupied work zone).

Also included are Layouts XX7A and XX7B. Layout XX7A (Operations On or Near Shoulder - Stationary) is proposed as replacement to current Layout 56 (Shoulder Closure), Layout 66 (Work off Shoulder) and Layout 67 (Special Operations). Layout XX7B (Traffic Control Devices on Shoulder - Stationary) is a new layout regarding the placement of traffic control equipment trailers (Category 4 devices) on the shoulder of the roadway. In the MN MUTCD, the current language for PCMSs is as follows: If a Portable Changeable Message sign is placed on the shoulder of the roadway, it shall be placed a minimum of 1.2 m (4 feet) from the edge of the traveled lane, and it shall be delineated with a full shoulder closure taper. The language is identical for Arrow Panels. In order to establish the proposed layout for traffic control devices located on the shoulder (Layout XX7B) we propose to request a change to the MN MUTCD for the standards on both devices. First change is that the term “full shoulder closure” should be changed to “appropriate shoulder closure”, since only a partial width closure may be appropriate in most situations, and the terminology “full” is not required. The second proposed change is to eliminate the 1.2m (4 feet) requirement on arrow panels located within the work zone transition area or beyond. The same 1.2m (4 feet) offset requirement for other trailer mounted devices (such as PCMSs) that located before the work zone transition area shall remain in the MUTCD and be designated on the Layout as shown. NOTE THAT THE INCLUDED LAYOUTS have been updated since the meeting.

ACTION ITEM: Marv will continue to make changes to the Field Manual and develop new layouts as requested by this TEO committee and the Local Group. As more changes are found, Marv will send the listing to committee members for comments.


ACTION ITEM: The proposed new layouts for the Field Manual (with corrections as proposed by the committee) have been attached to these minutes. Review the changes and make comments to Marv ASAP.

MN MUTCD Revision Discussion: The committee was presented with a revised Table for inclusion in the MN MUTCD Part 6.

The Table 6C-3 (Taper Lengths Criteria for Temporary Traffic Control Zones) was lacking information on shifting taper and shoulder taper lengths and had some mistakes in the formulas. The attached Table 6C-3 is the proposed corrected table and below the Table is the actual lengths for information purposes only while reviewing the new Table.

ACTION ITEM: The committee should review this Table and send comments to Marv ASAP if any problems are noticed.

TEM Chapter 8 Revisions UPDATE: The committee was given a copy of the draft revision to the TEM Chapter 8. It was mentioned

that the major changes included the removal of most of the appendix which included the Qualified Product List, and many other out-dated specifications and forms. The text for the chapter will remain relatively the same for the section describing the Traffic Management Plans and Traffic Control Plans, since this section will be substantially re-written following the implementation of the Final Rule on Mobility and Safety in Work Zones. However, some proposed clarifications were given by Mike Engh and will be reviewed for incorporation into that section. The sections on traffic control devices have been expanded to include more devices, although most of the chapter has been written to refer to other documents such as the MN MUTCD or continually updated documents that can be found on the Mn/DOT OTSO Work Zone website http://www.dot.state.mn.us/trafficeng/workzone/index.html such as the QPL.

Cross-over Design Previous Action Item: Dave Buss or Jon Jackels will work together to research a previous memo

developed and published in District 3 regarding cross-over design. Jon will work on determining whether a standard for cross-over design can be developed.

UPDATE: Jon distributed a proposed crossover design criteria information. ACTION ITEM: The committee should review and make comments. Please submit comments

directly to Jon. Next meeting was not scheduled: A notice will be emailed at a later date

http://www.dot.state.mn.us/trafficeng/workzone/index.html

Tech Memo Draft – May 1, 2006

MINNESOTA DEPARTMENT OF TRANSPORTATION Engineering Services Division

Technical Memorandum No. 06-xx-x-xx May , 2006

To: Distribution 57, 612, 618 and 650 From: Richard A. Stehr Division Director Engineering Services Subject Dynamic Speed Display Signs in Work Zones Expiration This is a new technical memorandum and will remain in effect until February 1, 2011, unless superseded before that date or incorporated into the Minnesota Manual on Uniform Traffic Control Devices (MN MUTCD). Implementation This policy shall be implemented immediately for all new installations. Introduction Dynamic Speed Display (DSD) signs are changeable message signs that display to approaching drivers the speed at which they are traveling within a work zone and may be installed in conjunction with either a Temporary Speed Limit sign, a Work Zone Speed Limit sign or an Advisory Speed Limit sign. The DSD signs shall only be used at key locations for maintenance and construction work zones to avoid overuse. Purpose The purpose of this technical memorandum is to give guidance for the installation of temporary dynamic speed display signs in work zones and to supplement the information found in the MN MUTCD. Information pertaining to the use of dynamic speed display signs may be found in the MN MUTCD Section 2B.13 which is quoted here:

OPTION A changeable message sign that displays to approaching drivers the speed at which they are traveling may be installed in conjunction with a Speed Limit sign. GUIDANCE If a changeable message sign displaying approach speeds is installed, the legend YOUR SPEED XX km/h (MPH) or such similar legend should be shown. The color of the changeable message legend should be a yellow legend on a black background. Compliance Date: December 22, 2013

Guidelines for Use of Dynamic Speed Display (DSD) Signs in Work Zones The Minnesota Department of Transportation has adopted the following guidelines for all trunk highways. Local road authorities may adopt similar additional guidelines for consistency. • DSD Sign Work Zone Usage Guidelines: The DSD sign should only be utilized within a reduced work

zone speed limit or when reduced advisory speed limits are posted. Temporary speed limits or existing speed limits within a work zone may utilize the DSD sign, but it’s usage is discouraged.


• DSD Sign Placement Guidelines: • The DSD sign should be mounted adjacent (above, below or beside) to the work zone speed limit

sign or work zone advisory speed limit sign. When the DSD sign can not be mounted adjacent to the speed sign, it should be located within 100 feet before the work zone speed sign.

• Stationary work zone DSD sign installations are typically trailer mounted, but post mounting or other temporary sign mounting systems are allowed. Moving and Mobile work zone DSD signs should be vehicle mounted, but trailer mounting may be allowed depending upon the type of work being performed.

• Only one DSD sign shall be installed per approach of a work space area. It is highly recommended to use DSD signs sparingly and strategically to avoid over usage of the devices, however, additional DSD signs may be installed within extremely long work spaces, where additional traffic enters the work zone (such as major freeway entrance ramps), or be placed before multiple occupied work areas. In stationary work zones, the DSD sign location(s) shall be reviewed daily as work progresses through the work space.

• Whenever DSD signs are used for worker safety it shall only operate while workers are present and adjacent to moving traffic. The DSD sign and accompanying speed sign should be located approximately the distance “A” ahead of the workers (typical distance between advance warning signs as shown in the current MN MUTCD Table 6C-1). As the workers proceed downstream, the DSD sign should also move such that it is never more than 760m (2500 feet) from the workers nor closer than 80m (250 feet) to the workers. These distances should be reduced where horizontal or vertical curves restrict the sight distance to the workers.

• If a DSD sign is installed for a Work Zone Advisory Speed Limit due to road conditions, then it should operate continuously while the potentially dangerous condition exists and the appropriate warning sign shall be displayed with the advisory speed limit. The DSD sign and accompanying speed sign should be located approximately the distance “A” ahead of the hazard (the typical distance between advance warning signs as shown in the current MN MUTCD Table 6C-1) and additional warning signs should be placed if necessary.

• If a DSD sign is installed within a Temporary Work Zone Speed Limit or an existing speed limit, then it may operate continuously while the speed limit is in effect. However, it is recommended that the DSD sign be utilized only where it is most imperative for the motorist to adjust speed to safely navigate through hazards such as near bypasses, drop-offs, narrow lanes, grade separations and pavement repair.

• DSD Sign Operational Settings:

• The DSD sign should provide the following display guidelines: o Shall not flash at oncoming drivers under any circumstances. o For measured speeds over a speed threshold setting, typically set 20 mph over the

posted regulatory speed limit, the DSD sign should display and hold the threshold value. o Be blank or display zero when no vehicles are present.

• DSD Sign Specifications:

• The legend shall read “YOUR SPEED” as a static message above the changeable message and “MPH” below the changeable message, with the font sized appropriately for legibility and centered on the DSD sign. The legend shall be black and the background color should match the speed limit sign adjacent to the DSD sign. A DSD sign background should be orange when the DSD sign is used with an advisory speed limit sign, and the DSD sign background should be white when used with a temporary regulatory speed limit sign.


• The changeable message portion of the DSD sign shall have a black background with yellow legend and display the speed of the approaching vehicle as “XX” in MPH. Existing installations shall be in compliance with this standard by December 22, 2013.

• The numbers on changeable message portion of the DSD sign shall be the same size or larger than the numbers on the regulatory or advisory speed limit sign it is paired with.

• The DSD sign installation shall comply with all MN MUTCD crashworthy requirements or it shall be installed behind guardrail or barrier. Currently trailer or truck mounted DSD signs are not required to meet NCHRP 350 crash testing levels.

Questions For information on the technical contents of this memorandum, please contact Jon Jackels at (651) 634-5428. Any questions regarding the publication and distribution of this Technical Memorandum should be referred to Sophia Wicklund, Design Standards Unit at (651) 296-3190. All active Memoranda and a list of historical Technical Memoranda can be viewed at http://www.dot.state.mn.us/tecsup/tmemo/index.html.

http://www.dot.state.mn.us/tecsup/tmemo/index.html

Channelizer Guidelines May 2, 2006 page 1 of 3

Discussion on the Selection of Appropriate Traffic Channelizers: prepared by Jon Jackels

There are 9 types of traffic channelizers included in Part 6 of the MN MUTCD. They are cones, tubular markers, surface mounted delineators, weighted channelizers, vertical panels, drums, Type I, II and III barricades. Each of these has specific design standards which include color, size, shape and retroreflectivity requirements. They each also include options and guidance statements for the appropriate application of each of the devices. In general the MN MUTCD standards and guidelines are the same as those included in the federal MUTCD. The major deviations are the use of cones, design of tubular markers, and application and definition of weighted channelizers. The MN MUTCD does not allow the use of cones in unattended work sites. This was done to eliminate the problem with cones being displaced over time in work zones, either by traffic or vandalism. Minnesota's tubular marker for high-speed (45mph and greater) is 4 inches in diameter and 36 inches tall compared to the federal minimum of 2 inches in diameter and 28 inches tall. This was done to make the tubular marker a similar surface area as a 28 inch cone, both day and night. The MN MUTCD has a separate section for the weighted channelizers rather than including it as a large traffic cone. It is important to review the appropriate sections of the MN MUTCD and federal MUTCD regarding the design and application of these various traffic channelizers. Both MUTCDs are available on the web. Minnesota's is at: http://www.dot.state.mn.us/trafficeng/otepubl/mutcd/index.html , the federal can be found at: http://mutcd.fhwa.dot.gov/pdfs/2003r1/pdf-index.htm There have been many discussions and concerns regarding the appropriate application of tubular markers and weighted channelizers on both construction and maintenance operations. To assist in resolving these issues the following information has been prepared for review and comment. TUBULAR MARKERS In both the federal and MN MUTCD it is stated that "Tubular markers may be used effectively to divide opposing lanes of road users, divide motor vehicle traffic lanes when two or more lanes are kept open in the same direction, and to delineate the edge of a pavement drop offs where space limitations do not allow the use of larger devices." They both also state "Tubular markers have less visible area than other devices and should be used only where space restrictions do not allow for the use of other more visible devices." Any changes to either of these application guidelines would have to be presented to and approved by the National Committee on Uniform Traffic Control Devices and the FHWA. However, as stated the tubular marker for Minnesota is as large as a cone so we may have some latitude to modify the space restriction guidance statement and allow tubular markers to be used as a substitute for cones. It must be noted that cones are not allowed in unattended work sites, this does not apply to tubular markers, however, we need to discuss if we would want to allow tubular markers as a substitute for cones for any and all applications where cones are allowed. If not, we will need to have specific criteria for where we should use them and request the Minnesota MUTCD Committee add this to the option statement in the MN MUTCD. It must be remembered that this would apply to smaller tubular markers on low speed streets and highways, not just the larger high-speed tubular marker design. Although the MN MUTCD allows the application of tubular markers where space is limited there are no specific requirements to replace these devices with larger channelizers when and if the space becomes available. For example, if you have a lane closed for paving and use tubular markers to delineate the closure


due to space limitations and leave the lane closed for less than three days (intermediate term work zone) with a pavement drop-off, the MN MUTCD does not specifically require the tubular markers be replaced with larger devices and I think it would be appropriate to leave these markers for this time. However, there has been discussion on whether tubular markers should be allowed in urban high-speed high-volume applications. We should consider some guidance information on when it is appropriate to use the tubular markers and leave them inplace for a short period of time. The Minnesota MUTCD Committee can add additional guidance for the application of any device without having the approval of the NCUTCD or the FHWA, as long as this guidance does not violate any minimum standards in the federal MUTCD. WEIGHTED CHANNELIZERS As stated above, the MN MUTCD has a separate section for the weighted channelizers rather than including it as a large traffic cone. Since this is only found in the MN MUTCD, the Minnesota MUTCD Committee has the ability to modify this section as long as it does not conflict with the federal MUTCD. The primary issue with the weighted channelizer is that it looks like a small drum. However, it is defined as a Type A (the smaller type) channelizer. The classification of channelizers is based on their size when viewed both day and night. The chart below shows the relative size of the various channelizing devices.

Surface Area of Common Channelizers Chart Date: May 2, 2006

Surface Area Channelizing Device Type

Day Night % Surface Mounted Delineators 90 20 22 Tubular Marker – 18 inch 36 N/A N/A Tubular Marker – 36 inch 144 32 22 Cone – 18 inch 80 N/A N/A Cone – 28 inch 130 35 26 Weighted Channelizer

A

252 86 34

Drum 648 288 44 Vertical Panel 270 270 100 Type I Barricade 270 270 100 Type II Barricade 384 384 100 Direction Indicator Barricade

B

384 384 100 Type III Barricade C 1152 1152 100 Federal and MN MUTCD requires a minimum of 270 square inches of reflective area for all barricades on all freeways, expressways and high speed highways. MN MUTCD requires weighted channelizers to have a minimum of 200 square inch cross sectional area for daytime visibility. The MN MUTCD only allows the application of weighted channelizers as follows: "Weighted channelizers have less visible area than other devices and should therefore be used only where space is limited or the presence of larger devices will restrict sight." It further states: "Weighted channelizers may be used effectively to divide opposing lanes of traffic and delineate the edge of pavement drop-offs. Although weighted channelizers are most commonly used to channelize or delineate road user flow, they may also be used alone or in groups to mark specific locations." This is similar to tubular markers but is somewhat less restrictive.


To resolve the proper application of weighted channelizers, the applications allowed in the MN MUTCD need better definition. Specifically limited space and restricted sight should be defined. GUIDELINES FOR ALL CHANNELIZERS After considering the above discussion the attached DRAFT guidelines for application of channelizing devices should be reviewed and commented on.

Guideline for Channelizer Applications

DRAFT May 2, 2006 Background The MN MUTCD contains specific standards and guidelines for the design and application of Channelizing Devices. These standards and guidelines are based on the ability of various devices to provide proper guidance and warning to drivers and pedestrians. Problem There have been many questions on the proper application of these channelizing devices in specific situations. The primary issue is the use of weighted channelizers in place of drums in tapers and to delineate the travel path through a work zone. Purpose The purpose of this guideline is to establish a standard practice for Mn/DOT maintenance and construction projects related to the application of channelizing devices. Scope This guideline applies to Mn/DOT operations only. Local road authorities are encouraged to assess their needs and establish practices appropriate to their operations. Guideline Sections 6F.58 through 6F.67 of the MN MUTCD contain specific standards and application guidelines for all channelizing devices. The following table provides additional guidance for the application of channelizing devices for various duration maintenance and construction work zones.

Channelizer Type Project Duration Transition Areas

(tapers and shifts) Tangent Areas

Long (3 days or more) B B1

Intermediate (less than 3 days or night work)

B B1

Short term (1 shift or less - daytime)

A or B A or B

1Weighted channelizers may be used:

a. If there is inadequate space for Type B channelizing devices; or b. If they are in an area where Type B channelizing devices cause a localized sight restriction.

Tubular Markers may be used to delineate the edge of a pavement drop off where space limitations do not allow the use of larger devices and the ADT is less than 5000. The channelizer types shown in the table shall be used as detailed unless engineering judgment dictates a deviation for a specific application. Temporary traffic control plans shall specify the channelizer type required for all applications on a project.

APPLICATION DURATION SPACING

MAXIMUM

TRANSITION SPACING

Low Speed / High

For flagging spacing see Note 10 below

MAXIMUM TANGENT SPACING

Low Speed / High

For flagging spacing see Note 11 below

TYPE

CHANNELIZING DEVICE NAME

See Note 9 below

NOTE: These devices are referenced as channelizing devices ONLY, and should not be used to shield pedestrians, including workers, from vehicle impacts or obstacles. C

HA

NN

EL

IZE

MA

RK

HA

ZA

RD

CL

OSE

RO

AD

WA

Y

RE

STR

ICT

TR

AFF

IC

SHO

RT

TE

RM

INT

ER

ME

DIA

TE

TE

RM

LO

NG

TE

RM

meters

feet

meters

feet

MN MUTCD

A CONE – 28 INCH 1 2 1 10/15 25/50 10/15 25/50 6F.59

A TUBULAR MARKER - 18 INCH 3 N/A N/A 10/ NA 25/ NA 6F.60

A TUBULAR MARKER - 36 INCH 3 N/A N/A 15/30 50/100 6F.60

A SURFACE MOUNTED DELINEATOR 4 N/A N/A 10/ NA 25/ NA 6F.60.1

A OPPOSING TRAFFIC DIVIDER 5 N/A N/A 15/30 50/100 6F.70

A WEIGHTED CHANNELIZER 6 6 6 10/15 25/50 10/15 50/100 short25/50 inter+ 6F.60.2

B DRUM 8a 10/15 25/50 15/30 50/100 6F.62

B VERTICAL PANEL 10/15 25/50 15/30 50/100 6F.61

B TYPE I BARRICADE 10/15 25/50 15/30 50/100 6F.63

B TYPE II BARRICADE 10/15 25/50 15/30 50/100 6F.63

B DIRECTION INDICATOR BARRICADE 7 8c 7 30/60 100/200 150/30

0 500/1000 6F.64

C TYPE III BARRICADE 8 N/A N/A 150/300 500/1000 6F.63

C LONGITUDINAL CHANNELIZING BARRICADES 8b N/A N/A 150/30

0 500/1000 6F.66

C PORTABLE BARRIER N/A N/A N/A N/A 6F.65

C RAISED ISLAND N/A N/A N/A N/A 6F.69

NOTES: Definition : Low Speed: Posted Speed Limit less than 45 mph High Speed: Posted Speed Limit 45 mph or greater

1. Device shall not be used in unattended work zones. 2. Emergency use only. 3. Tubular Markers that are 36 inches high or taller may be used on rural roadways to delineate a pavement drop if there is inadequate space

for larger devices. 18 inch high tubular markers may only be used for daytime work and where posted speed limits are less than 45 mph.. 4. Surface Mounted Delineators may be used as centerline dividers to separate opposing motor vehicle traffic on a two-lane, two-way

operation where the roadway is posted at less than 45 mph. 5. Opposing Traffic Lane Dividers may be used as centerline dividers to separate opposing motor vehicle traffic on a two-lane, two-way

operation. The device may replace either a tubular marker or surface mounted delineator when added lane confirmation is needed such as at intersections.

6. Weighted Channelizers may be used only if there is inadequate space for Type B channelizing devices, or within portions of transition or tangent areas where Type B channelizing devices would cause a localized sight restriction.

7. Directional Indicator Barricades may be used (day or night) only in attended work zones and two flashing arrow boards are installed for the merging taper (as shown on Layout XX). Additional Type A or B devices should be used on a spacing of 10m (25 feet), and 15m (50 feet) for speeds 45 mph or greater, to prevent traffic intrusion through the merging taper.

8. Type C channelizing devices (Type III Barricades) are placed within the closed lane to prevent traffic intrusion into the closed lane. Three substitutions are allowed for the Type III barricade:

a. Three drums in a row across the closed lane. b. Longitudinal Channelizing Barricades combined for a 2m. (6 ft) minimum total length placed across the closed lane. c. In an attended work zone, a direction indicator barricade placed in the closed lane near the lane line and the arrow pointing

towards the open lane. 9. Other channelizing devices conforming to the general size, color, retro-reflection and placement characteristics may be used in special

situations based upon an engineering study. 10. For a Two Way Traffic Taper, such as for typical flagging operations, the maximum spacing is 3m (12 feet) and a total taper length of 15m

(50 feet). 11. For flagging operations (including AFAD or portable signals) if the minimum paved lane width is less than 3m (12 feet) (distance from

channelizer device to outside edge of pavement including paved shoulder), then maximum spacing shall be 15 m (50 feet). The channelizing devices in the tangent area may be eliminated if a pilot car operation is provided.

TABLE 6F-3 Recommended Application and Maximum Spacing of Channelizing Devices

Sohl1Mar

Note

Table 6F-3 as handed out at the meeting (this is for insertion into Part 6 only)

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Page and/or Layout No.s

PROPOSED CHANGES for the 2007 FIELD MANUAL (as of March 29, 2006)

Index B Remove Moving Operations and Add Short Duration (up to one hour duration) Remove “during daylight hours” from Mobile Operations

Introduction Update all page references Remove Moving Operations and Add Short Duration (up to one hour duration) Add guidelines for Channelizing Devices to the “Selecting TTC Devices” Add common notes from layouts (to remove clutter from layouts) Add layout defining the various types of tapers, etc. Update “Symbols Used” page for new symbols in layouts

Moving 6K-2 Entire section will be moved to the Mobile Section and combine the indexes together Mobile 6K-10 Road Closure (Layout 12) should be “Ramp Closure” Layout 7 Note 2 should refer to Layout 8 instead of 10 Layout 14 remove Taper L chart

place 50 feet on drawing for taper length change channelizing device note(s)

Layout 15 Add “ONE OPERATOR CONTROL” to the Layout Title remove Taper L chart place 50 feet on drawing for taper length change channelizing device note(s) Label length of work zone at 800 feet maximum Change Note 3 to say: Restrictions on distance between AFADs and roadway ADT may be eliminated if operators (equipped with proper communications) are located near both AFADs.

Layout 16 Add flashers to the STOP signs Remove flashers from Advance Signs (except the STOP AHEAD sign)

Layout 17 remove Taper L chart place 50 feet on drawing for taper length change channelizing device note(s)

Layout 18 change channelizing device note(s) remove flashers from Advance Signs remove “No Passing Zone” sign

Layout 19 re-write Note 1 for clarity of duration Layout 20 change Taper L chart to 30 mph = 200 feet etc.

change L to L/2 on drawing change channelizing device note(s) remove flashers from Advance Signs

Layout 21 change chart for Taper L to same note as on Layout 23 (L=WS) change channelizing device note(s) possibly combine with Layout 22

Layout 22 change chart for Taper L to same note as on Layout 23 (L=WS) change channelizing device note(s)

Layout 23 Taper L note should be see note 4 instead of 5 change channelizing device note(s)

Layout 25 change note 6 to: “Walkway shall meet ADA requirements (see checklist in MN MUTCD Part 6 – Section 6D)”.

Layout 26 add note 4: “Walkway shall meet ADA requirements (see checklist in MN MUTCD Part 6 – Section 6D)”

Layout 27 change Taper L chart to 30 mph = 200 feet etc. change L to L/2 on drawing for shifting tapers change channelizing device note(s) remove flashers from Advance Signs revise Type III Barricade symbols to “Barricade or Arrowboard if over 40mph”

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Layout 28 change Taper L chart to 30 mph = 200 feet etc. change L to L/2 on drawing for shifting tapers change channelizing device note(s) remove flashers from Advance Signs

Layout 29 add 70-75 mph data on charts ??? remove Note 1 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “ remove reference to note 1 on PCMS

Layout 30 remove Note 1 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “ remove reference to note 1 on PCMS

Layout 31 add 70-75 mph data on charts ??? change channelizing device note(s) remove Type III options (arrowboards are required on high speed) remove Note 2 remove reference to note 2 on PCMS

Layout 32 add 70-75 mph data on charts ??? (and missing grey on 60-65 box) remove Note 1 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “ remove reference to note 1 on PCMS change L to L/2 (shifting taper) where the lane shifts occur

Layout 33 remove Note 1 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “ remove reference to note 2 on PCMS remove flashers from Advance Signs

Layout 34 remove Note 1 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “ remove reference to note 2 on PCMS remove flashers from Advance Signs

Layout 35 change Taper L chart to 30 mph = 200 feet etc. change channelizing device note(s) change references to other Layouts to the proper numbers (30 & 32) remove flashers from Advance Signs

Layout 36 change channelizing device note(s) remove flashers from Advance Signs

Layout 37 remove Note 1 and add * required for nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “ remove reference to note 2 on PCMS

Layout 38 remove Note 1 remove reference to note 2 on PCMS change channelizing device note(s) remove Type III options (arrowboards are required on high speed)

Layout 39 remove Note 2 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “ remove reference to note 3 on PCMS

Layout 40 remove Note 2 and revise * to include nighttime and intermediate term operations change channelizing device note(s) remove reference to note 3 on PCMS

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Layout 41 add * required for nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade symbol on shoulder to “Barricade or Arrowboard with * “

Layout 42 remove Note 2 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade at beginning of tapers to “Barricade or Arrowboard with * “ remove reference to note 2 on PCMS

Layout 43 remove Note 2 and revise * to include nighttime and intermediate term operations change channelizing device note(s) remove reference to note 2 on PCMS

Layout 44 remove Note 2 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade at beginning of tapers to “Barricade or Arrowboard with * “ remove reference to note 2 on PCMS remove flashers from Advance Signs change Taper L chart to 30 mph = 200 feet etc. what are taper lengths for turn lanes??? change 6G to L in tangent area

Layout 45 remove Note 2 and revise * to include nighttime and intermediate term operations change channelizing device note(s) revise Type III Barricade at beginning of tapers to “Barricade or Arrowboard with * “ remove reference to note 2 on PCMS remove flashers from Advance Signs change Taper L chart to 30 mph = 200 feet etc. what are taper lengths for turn lanes??? change 6G to L in tangent area

Layout 46 change Taper L chart to 30 mph = 200 feet etc. change L to L/2 on drawing for shifting tapers change channelizing device note(s) remove flashers from Advance Signs

Layout 47 change channelizing device note(s) remove flashers from Advance Signs Show 3 drums as an alternate for a Type III in the closure





Layout 52 change channelizing device note(s) remove flashers from Road Work Ahead Sign

Layout 53 change channelizing device note(s) remove flashers from Road Work Ahead Signs

Layout 54 change channelizing device note(s) remove flashers from Advance Signs change Taper L chart to 30 mph = 200 feet etc. change L to L/3 on drawing for shoulder tapers


Layout 56 change channelizing device note(s) remove flashers from Advance Signs change the Type III symbol to a Category 4 such as an arrowboard, PCMS or AFAD (or other vehicles without a TMA).

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add Note 2: Channelizing Devices required for durations of an hour or more. change Taper L chart to 30 mph = 200 feet etc. change L to L/3 on drawing for shoulder tapers

Layout 57 remove taper chart change channelizing device note(s) label length of work space as 500 feet maximum use 50 feet for taper

Layout 58 remove taper chart change channelizing device note(s) label length of work space as 500 feet maximum

Layout 59 remove taper chart change channelizing device note(s) use 50 feet for taper

Layout 60 change channelizing device note(s) Layout 61 change channelizing device note(s)

remove option b in Note 4 Layout 62 remove option b in Note 4 Layout 63 remove taper chart

change channelizing device note(s) use 50 feet for taper remove flashers from Advance Signs

Layout 64 remove flashers from Advance Signs Layout 65 remove flashers from Advance Signs Layout 66 ??? is this ok ??? Layout 67 the chart for G should be 25 and 50 feet only

add Taper L chart to 30 mph = 200 feet etc. label taper length as L/3 for a shoulder taper change channelizing device note(s) Note 3 should say channelizing devices are optional only for operations of one hour or less. ??? is this any different than layout 56 ??? MOVE TO SHORT DURATION SECTION

Layout 68 change channelizing device note(s) MOVE TO SHORT DURATION SECTION

Layout 69 remove taper chart use 50 feet on taper change channelizing device note(s MOVE TO SHORT DURATION SECTION

Layout 70 change channelizing device note(s) MOVE TO SHORT DURATION SECTION

Layout 71 change Taper L chart to 30 mph = 200 feet etc. change L to L/3 on drawing for shoulder tapers correct typo in Note 3 “use” add Note 4: If ADT is greater than 1500 or the speed limit is greater than 40 mph, then use either Layout 56 or Layout 67. change channelizing device note(s)

Layout 73 add note “ * required for speeds greater than 40 mph” revise Type III Barricade at beginning of tapers to “Barricade or Arrowboard with * “ add note to drawing “See appropriate layout(s) for advance signing and devices” change channelizing device note(s)

Layout 74 add note “ * required for speeds greater than 40 mph” revise Type III Barricade at beginning of tapers to “Barricade or Arrowboard with * “ change channelizing device note(s)

add layouts Speed Display Signs in Work Zones for “Worker Safety” and Roadway Conditions” 6K-97 revise drawing to proper signs on barricades, etc. and revise with typical NCHRP 350

compliant portable sign support structures

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6K-98 and 99 revise to show Channelizing Types A, B and C, remove sign stands pics 6K-101 and 102 in chart, Drums max spacing should be 2S (not 4S) 6K-105 revise min. character height on chart for Type B 6K-123 Layout 1 change channelizing device note(s) add layout 2 Pilot Car Operations

TEO Work Zone Safety Committee Meeting - MnDOT...Issued on May 1, 2006 Page 1 of 4 TEO Work Zone...

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Transcript of TEO Work Zone Safety Committee Meeting - MnDOT...Issued on May 1, 2006 Page 1 of 4 TEO Work Zone...