Office of Traffic, Safety and Technology Module 4 Work Zone Applications Traffic Control Plan...

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Module 4Work Zone Applications

Traffic Control Plan Development Course

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ProjectsA wide variety of projects for

TTC existSome include:

– Mill and Overlay– CPI– Left turn lane construction– Bridge deck repair– ADA jobs– Full reconstruction (cross-over &

detour)2

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ProjectsCont.

– Bridge painting– Centerline Rumbles

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Control Strategies

Temporary traffic control strategies, devices, and contracting/ construction techniques and coordination are used to facilitate traffic flow and safety through and around work zones

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Control Strategies

Construction Phasing/Staging– Staging refers to how the contractor

will position the equipment and materials

– Phasing refers to the sequencing of the aspects of the project-one project at a time

– The impacts of a work zone on traffic can be minimized by using operationally-sensitive phasing and staging throughout the life of the project 5

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Control Strategies

Full Roadway Closures– Involves complete closure of a roadway

for periods of time to minimize the duration of the project and improve worker safety

– Closures maybe brief, short-term or long-term

– Lane shifts or closures last for varying durations of time

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Control Strategies

Reduced Lane Widths to Maintain Number of Lanes (Constriction)– Involves reducing the width of one or

more lanes to maintain the existing number of lanes

– Reduce shoulder width to maintain number of lanes

– Shoulder closures– Lane shift to shoulder/median

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Control Strategies

One-Lane, Two-Way Operation– Involves using one lane for both

directions of traffic, allowing work activities to occur in the other lane that is now closed

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Control Strategies

Two-Way Traffic on One Side of Divided Facility (Crossover)– Involves closing one side of a divided

facility to permit the work to proceed without traffic interference while both directions of traffic are accommodated on the opposing side of the roadway

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Control Strategies

Reversible Lanes– Also known as variable lanes or contra-

flow lanes, involves sharing lane(s) of travel to accommodate peak-period traffic flow

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Control Strategies

Ramp Closures/Relocation– Closing one or more ramps in or near

the work zone for specific time periods or construction phases to allow work access or improve traffic flow on the mainline

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Control Strategies

Freeway-To-Freeway Interchange Closures– Involves closing one or more freeway-

to-freeway interchange connectors over a period of time

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Control Strategies

Night Work– Work is performed at night (end of

evening peak period to beginning of morning peak period) to minimize work zone impacts on traffic and adjacent businesses

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Control Strategies

Weekend Work– Construction work (all or individual

phases) is restricted to weekend periods from the end of the Friday afternoon peak period to the beginning of the Monday morning peak period

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Control Strategies

Work Hour Restrictions for Peak Travel– Restricting work hours of the work that

may impact traffic does not occur during periods of peak travel demand and congestion (e.g., peak hours, holidays, and special events)

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Control Strategies

Pedestrian/Bicycle Access Improvements– Involves providing alternate facilities

for bicyclists and pedestrians (including those with disabilities in accordance with the Americans with Disabilities Act of 1990) in places where the work zone impacts their accessibility

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Control Strategies

Business Access Improvements– Some projects will have a direct impact

on businesses, particularly to accessibility

– Accessibility improvements for businesses may include signage or information to direct motorists to the business(es) and/or relocation of access locations

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Control Strategies

Off-Site Detours/Use of Alternate Routes– Involves re-routing some or all traffic

off of the roadway under construction and to other existing roadways

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MUTCD Work Zone Layout

Common Work Zone Layouts– Trained Editorial Discussion – Keeping Editorial No-nonsense

(TED)

(KEN)

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6J-I General– These layouts should be used during

the development of detailed traffic control plans

– They should only be used under the direction of a traffic engineering professional

– They should be combined with the principles and figures contained elsewhere in this manual

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Symbols

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TTC Template Sheets for Stationary Work Zones

www.dot.state.mn.us/trafficeng/workzone/ttc-templets.html#metro

http://www.dot.state.mn.us/trafficeng/workzone/ttc-templets.html

http://www.dot.state.mn.us/trafficeng/workzone/ttc-templets.html

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Barrier Use

Positive Work Zone Protection– Title 23 CFR 630.1108(a) indicates that

the need for longitudinal traffic barrier and other positive protection devices shall be based on an engineering study

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Barrier Use

Positive Work Zone Protection– Use positive protective measures to

separate workers on highway construction projects

– Use temporary longitudinal traffic barriers to protect workers on highway construction projects in long-duration stationary work zones when the project design speed is anticipated to be high & the nature of the work requires workers to be within 1 lane-width from the edge of a live travel lane 50

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Barrier Use

Positive Work Zone Protection– When positive protective devices are

necessary, those devices are paid for on a unit-pay basis, unless doing so would create a conflict with innovative contracting approaches, such as designbuild or some performance-based contracts

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Barrier Use

Work Zone Drop-Offs– Additional channelizing devices should be

placed in areas that may be considered hazardous to the public or workers• Full longitudinal channelizing when traffic is

adjacent to longitudinal drop-offs greater than 4 inches

• Full longitudinal channelizing and barriers when traffic is adjacent to longitudinal drop-offs greater than 12 inches

• Full longitudinal channelizing when roadway geometry, dust, weather, or darkness restricts visibility of the open travel lane

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Office of Traffic, Safety and Technology Module 4 Work Zone Applications Traffic Control Plan...

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