January 2, 2018 Mr. D. Bruce Wheeler 148 Park Street 93 ...
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35 New England Business Center Drive Suite 140 Andover, MA 01810-1066 Office 978-474-8800 Fax 978-688-6508 Web: www.rdva.com Ref: 7829 January 2, 2018 Mr. D. Bruce Wheeler Habitech Communities 148 Park Street North Reading, MA 01864 Re: Sight Distance and Intersection Spacing Assessment 93 Foster Street Littleton, Massachusetts Dear Bruce: Vanasse & Associates, Inc. (VAI) has completed an assessment of lines of sight and intersection spacing with respect to the proposed access to the residential subdivision to be located at 93 Foster Street in Littleton Massachusetts (hereafter referred to as the “Project”). Specifically, this assessment reviews: i) lines of sight to and from the Project site roadway intersection with Foster Street based on the current Site Plan for the development, a copy of which is attached, and using measured travel speeds along Foster Street approaching the proposed roadway; and ii) the off-set along Foster Street between the Project site roadway and Mill Street with regard to Section 249-43 of the Town of Littleton Subdivision of Land Use Regulations and accepted engineering standards for safe operation. Sight Distance In order complete the sight distance assessment, traffic volumes and vehicle travel speeds were measured along Foster Street over a continuous 48-hour period on December 19 th and 20 th , 2017 (Tuesday and Wednesday, respectively). Table 1 summarizes the collected traffic volume and vehicle travel speed data. Table 1 FOSTER STREET TRAFFIC VOLUME AND TRAVEL SPEED MEASUREMENTS Location AWT a VPH b K Factor c 85 th Percentile Vehicle Travel Speed d Foster Street, south of Mill Road 2,310 192/227 8.3/9.8 34 mph NB/34 mph SB a Average weekday traffic in vehicles per day b Vehicles per hour (AM/PM peak-hour) c Percent of daily traffic occurring during the peak-hour (AM/PM peak-hour) d Speed at which 85 percent of the observed vehicles travelled at or below in miles per hour (mph) NB = northbound; SB = southbound; EB = eastbound; WB = westbound
Transcript of January 2, 2018 Mr. D. Bruce Wheeler 148 Park Street 93 ...
35 New England Business Center Drive Suite 140 Andover, MA 01810-1066 Office 978-474-8800 Fax 978-688-6508 Web: www.rdva.com
Ref: 7829 January 2, 2018 Mr. D. Bruce Wheeler Habitech Communities 148 Park Street North Reading, MA 01864 Re: Sight Distance and Intersection Spacing Assessment 93 Foster Street Littleton, Massachusetts Dear Bruce: Vanasse & Associates, Inc. (VAI) has completed an assessment of lines of sight and intersection spacing with respect to the proposed access to the residential subdivision to be located at 93 Foster Street in Littleton Massachusetts (hereafter referred to as the “Project”). Specifically, this assessment reviews: i) lines of sight to and from the Project site roadway intersection with Foster Street based on the current Site Plan for the development, a copy of which is attached, and using measured travel speeds along Foster Street approaching the proposed roadway; and ii) the off-set along Foster Street between the Project site roadway and Mill Street with regard to Section 249-43 of the Town of Littleton Subdivision of Land Use Regulations and accepted engineering standards for safe operation. Sight Distance In order complete the sight distance assessment, traffic volumes and vehicle travel speeds were measured along Foster Street over a continuous 48-hour period on December 19th and 20th, 2017 (Tuesday and Wednesday, respectively). Table 1 summarizes the collected traffic volume and vehicle travel speed data.
Table 1 FOSTER STREET TRAFFIC VOLUME AND TRAVEL SPEED MEASUREMENTS
Location AWTa VPHb K Factorc 85th Percentile Vehicle
Travel Speedd Foster Street, south of Mill Road
2,310
192/227
8.3/9.8
34 mph NB/34 mph SB
aAverage weekday traffic in vehicles per day bVehicles per hour (AM/PM peak-hour) cPercent of daily traffic occurring during the peak-hour (AM/PM peak-hour) dSpeed at which 85 percent of the observed vehicles travelled at or below in miles per hour (mph) NB = northbound; SB = southbound; EB = eastbound; WB = westbound
Mr. D. Bruce Wheeler January 2, 2018 Page 2 of 5
G:\7829 Littleton, MA\Letters\93 Foster Street Sight Line Assessment 01.02.18.docx
As can be seen in Table 1, Foster Street in the vicinity of the Project site accommodates approximately 2,310 vehicles on an average weekday (two-way, 24-hour volume), with peak flow rates of 192 vehicles per hour (vph) during the weekday morning peak-hour and 227 vehicles per hour during the weekday evening peak-hour. The prevailing or 85th percentile vehicle travel speed (the speed at which 85 percent of the observed vehicles travelled at or below) was found to be 34 miles per hour (mph) in both the north and southbound directions, which is 9 mph above the posted speed limit (25 mph). The 85th percentile vehicle travel speed is typically used to establish posted speed limits and forms the basis of roadway and intersection design, including the assessment of lines of sight. As such, while the posted speed limit is 25 mph, sight lines to and from the Project site roadway need to meet the requirements for an approach speed of up to 34 mph. Sight distance requirements are evaluated following the methodology defined by the American Association of State Highway and Transportation Officials (AASHTO).1 This methodology is based on scientific studies that have been conducted with regard to the braking performance of vehicles on wet pavement and driver perception and reaction times. Two types of sight distances are evaluated for an intersection: stopping sight distance (SSD) and intersection sight distance (ISD). In brief, SSD is the distance required by a vehicle traveling at the design speed of a roadway (34 mph in this case), on wet pavement, to stop prior to striking an object in its travel path. ISD or corner sight distance (CSD) is the sight distance required by a driver entering or crossing an intersecting roadway to perceive an on-coming vehicle and safely complete a turning or crossing maneuver with on-coming traffic. ISD is also referred to as the “operational sight distance” as it is related to maintaining the operational performance of the intersecting roadway by ensuring that a motorist exiting from a driveway or side street is able to enter the traffic stream without requiring an approaching motorist to substantially reduce their approach speed. In accordance with AASHTO standards, if the measured ISD is at least equal to the required SSD value for the appropriate design speed, the intersection can operate in a safe manner. The higher ISD values are typically required along major arterials and highways where entering vehicles can have a material impact on the performance of the roadway network. Table 2 summarizes the results of the sight distance evaluation for the Project site roadway intersection with Foster Street based on the current site plan.
1A Policy on Geometric Design of Highway and Streets, 6th Edition; American Association of State Highway and Transportation
Officials (AASHTO); Washington D.C.; 2011.
Mr. D. Bruce Wheeler January 2, 2018 Page 3 of 5
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Table 2 SIGHT DISTANCE MEASUREMENTSa
Feet
Intersection/Sight Distance Measurement
Recommended Minimum
(SSD)
Desirable but Not Required
(ISD)b Measured Foster Street at the Project Site Roadway
Stopping Sight Distance: Foster Street approaching from the north Foster Street approaching from the south Intersection Sight Distance: Looking to the north from the Project roadway Looking to the south from the Project roadway
240 240
240 240
-- --
325/375 325/375
360 263 297/500+c 264
aRecommended minimum values obtained from: A Policy on Geometric Design of Highways and Streets, 6th Edition; American Association of State Highway and Transportation Officials (AASHTO); 2011; and based on an approach speed of 34 mph along Foster Street.
bValue shown is the intersection sight distance for a vehicle turning right/left exiting a roadway or driveway under STOP control such that motorists approaching the intersection on the major street should not need to adjust their travel speed to less than 70 percent of their initial approach speed.
cWith trimming/removal of trees and vegetation located to the north of the Project site roadway. As can be seen in Table 2, lines of sight at the Project site roadway intersection with Foster Street were found to exceed the required minimum sight distance for safe operation (SSD). Lines of sight looking to the north from the Project site roadway (toward Mill Road) can be increased to over 500-feet with the selective trimming and/or removal of trees and vegetation located along the west side of Littleton Road and north of the Project site roadway. The subject vegetation is located within the public right-of-way or the Project site, and it appears that activities associated with the construction of the Project site roadway and the proposed infiltration basin that is to be located to the north of the driveway will require that this vegetation be altered thereby increasing the available sight lines.
Mr. D. Bruce Wheeler January 2, 2018 Page 4 of 5
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Sight Lines Approaching the Project Site Roadway
View to the South View to the North
Sight Lines Exiting the Project Site Roadway
Looking to the South Looking to the North Intersection Off-Set Chapter 249, Subdivision of Land Regulations, Section 249-43, Streets and Paths, Subsection D, Access Control and Intersections, of the Code of the Town of Littleton, Massachusetts, requires that new intersections shall be at least 300-feet apart (Part 5), and that street intersections along all collector and arterial streets (Foster Street is functionally classified by the Massachusetts Department of Transportation (MassDOT) as an urban collector roadway) shall be spaced not less than 400-feet apart (Part 10). A review of the Site Plan indicates that the centerline of the Project site roadway is located approximately 323-feet south of Mill Street, which complies with the 300-foot separation requirement for new intersections (Part 5) but is below the 400-foot separation requirement for new intersections along arterial and collector roadways. Chapter 6, Intersection Design, Section 6.8.2.1, Spacing Between Public Intersections, of the 2006 Massachusetts Highway Department Project Development & Design Guide, recommends minimum spacing between intersections of 200-feet for design speeds of between 15 and 30 mph, and 250-feet for
Mr. D. Bruce Wheeler January 2, 2018 Page 5 of 5
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design speeds of between 35 and 40 mph. At a minimum, the separation between intersections should be equal to the stopping sight distance for the design speed of the major roadway, or 240-feet in the case of Foster Street in the vicinity of the Project site roadway (see Table 2). Given that the Project site roadway is located in excess of 300-feet from Mill Road, the intersection separation is sufficient to allow both intersections to function in a safe manner and complies with MassDOT intersection spacing standards for the appropriate design speed along Foster Street. If you should have any questions regarding this assessment or would like to discuss our findings in more detail, please feel free to contact me. Sincerely, VANASSE & ASSOCIATES, INC. Jeffrey S. Dirk, P.E., PTOE, FITE Principal Professional Engineer in CT, MA, ME, NH, RI and VA JSD/jsd Attachments: Site Plan Automatic Traffic Recorder Counts Vehicle Travel Speed Measurements MassDOT Intersection Spacing Guidelines
ATTACHMENTS SITE PLAN AUTOMATIC TRAFFIC RECORDER COUNTS VEHICLE TRAVEL SPEED MEASUREMENTS MASSDOT INTERSECTION SPACING GUIDELINES
SITE PLAN
AUTOMATIC TRAFFIC RECORDER COUNTS
Page 1 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
7829VOL1
Accurate Counts978-664-2565
Start 12/19/2017 NB Hour Totals SB Hour Totals Combined TotalsTime Tue Morning Afternoon Morning Afternoon Morning Afternoon Morning Afternoon Morning Afternoon
12:00 0 23 2 2112:15 1 20 0 1512:30 1 26 1 1712:45 0 19 2 88 0 20 3 73 5 16101:00 2 22 2 1201:15 1 24 1 2801:30 0 28 0 2201:45 1 25 4 99 0 16 3 78 7 17702:00 1 17 0 2002:15 0 26 0 1702:30 0 23 0 2202:45 0 16 1 82 0 20 0 79 1 16103:00 1 19 0 2803:15 0 19 0 2203:30 1 19 0 2403:45 0 18 2 75 0 21 0 95 2 17004:00 0 30 0 1304:15 0 11 0 2404:30 2 27 0 1604:45 1 26 3 94 2 14 2 67 5 16105:00 0 30 2 2205:15 2 62 2 1905:30 5 21 2 2105:45 5 20 12 133 5 27 11 89 23 22206:00 3 32 8 2406:15 3 11 8 2106:30 2 32 21 1606:45 16 15 24 90 38 11 75 72 99 16207:00 23 17 33 807:15 20 6 33 1407:30 23 17 21 1107:45 32 6 98 46 16 2 103 35 201 8108:00 22 5 18 1308:15 23 16 16 908:30 15 3 17 1208:45 20 2 80 26 18 8 69 42 149 6809:00 18 4 12 1109:15 19 1 19 509:30 18 3 9 809:45 9 5 64 13 18 4 58 28 122 4110:00 9 0 10 210:15 10 1 10 210:30 12 2 13 210:45 12 3 43 6 6 7 39 13 82 1911:00 10 8 9 111:15 14 1 13 211:30 18 3 14 011:45 24 4 66 16 19 2 55 5 121 21Total 399 768 418 676 817 1444
Percent 34.2% 65.8% 38.2% 61.8% 36.1% 63.9%
Page 2 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
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Start 12/20/2017 NB Hour Totals SB Hour Totals Combined TotalsTime Wed Morning Afternoon Morning Afternoon Morning Afternoon Morning Afternoon Morning Afternoon
12:00 1 26 3 2612:15 1 18 2 2212:30 0 19 0 1912:45 0 19 2 82 0 20 5 87 7 16901:00 0 14 2 2201:15 1 17 0 1901:30 1 23 0 2201:45 0 23 2 77 0 19 2 82 4 15902:00 1 12 0 1302:15 0 22 0 1902:30 0 19 0 2702:45 0 22 1 75 0 31 0 90 1 16503:00 0 23 0 2303:15 0 22 0 2003:30 0 16 0 1803:45 1 29 1 90 1 17 1 78 2 16804:00 0 33 1 2404:15 0 17 0 2504:30 1 29 0 2504:45 3 20 4 99 3 18 4 92 8 19105:00 1 37 2 2605:15 0 52 1 2805:30 2 19 1 3105:45 6 12 9 120 5 28 9 113 18 23306:00 3 41 8 2206:15 11 8 10 2006:30 7 39 19 706:45 23 14 44 102 44 21 81 70 125 17207:00 16 12 29 1307:15 19 12 33 2207:30 19 12 25 707:45 30 10 84 46 12 1 99 43 183 8908:00 18 7 26 1308:15 26 14 13 1208:30 25 5 17 508:45 22 3 91 29 18 5 74 35 165 6409:00 19 2 12 509:15 16 6 15 509:30 14 3 11 509:45 18 4 67 15 9 5 47 20 114 3510:00 23 0 8 510:15 15 1 7 410:30 12 0 15 410:45 17 3 67 4 12 3 42 16 109 2011:00 17 6 14 011:15 22 2 12 311:30 16 5 17 211:45 28 0 83 13 18 2 61 7 144 20Total 455 752 425 733 880 1485
Percent 37.7% 62.3% 36.7% 63.3% 37.2% 62.8%GrandTotal
854 1520 843 1409 1697 2929
Percent 36.0% 64.0% 37.4% 62.6% 36.7% 63.3%
ADT ADT 2,313 AADT 2,313
Page 1 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
7829VOL1
Accurate Counts978-664-2565
Start 12/18/2017 Tue Wed Thu Fri Sat Sun Week AverageTime NB SB NB SB NB SB NB SB NB SB NB SB NB SB NB SB
12:00 AM * * 2 3 2 5 * * * * * * * * 2 401:00 * * 4 3 2 2 * * * * * * * * 3 202:00 * * 1 0 1 0 * * * * * * * * 1 003:00 * * 2 0 1 1 * * * * * * * * 2 004:00 * * 3 2 4 4 * * * * * * * * 4 305:00 * * 12 11 9 9 * * * * * * * * 10 1006:00 * * 24 75 44 81 * * * * * * * * 34 7807:00 * * 98 103 84 99 * * * * * * * * 91 10108:00 * * 80 69 91 74 * * * * * * * * 86 7209:00 * * 64 58 67 47 * * * * * * * * 66 5210:00 * * 43 39 67 42 * * * * * * * * 55 4011:00 * * 66 55 83 61 * * * * * * * * 74 58
12:00 PM * * 88 73 82 87 * * * * * * * * 85 8001:00 * * 99 78 77 82 * * * * * * * * 88 8002:00 * * 82 79 75 90 * * * * * * * * 78 8403:00 * * 75 95 90 78 * * * * * * * * 82 8604:00 * * 94 67 99 92 * * * * * * * * 96 8005:00 * * 133 89 120 113 * * * * * * * * 126 10106:00 * * 90 72 102 70 * * * * * * * * 96 7107:00 * * 46 35 46 43 * * * * * * * * 46 3908:00 * * 26 42 29 35 * * * * * * * * 28 3809:00 * * 13 28 15 20 * * * * * * * * 14 2410:00 * * 6 13 4 16 * * * * * * * * 5 1411:00 * * 16 5 13 7 * * * * * * * * 14 6Lane 0 0 1167 1094 1207 1158 0 0 0 0 0 0 0 0 1186 1123
Day 0 2261 2365 0 0 0 0 2309AM Peak - - 07:00 07:00 08:00 07:00 - - - - - - - - 07:00 07:00
Vol. - - 98 103 91 99 - - - - - - - - 91 101PM Peak - - 17:00 15:00 17:00 17:00 - - - - - - - - 17:00 17:00
Vol. - - 133 95 120 113 - - - - - - - - 126 101
Comb.Total
0 2261 2365 0 0 0 0 2309
ADT ADT 2,313 AADT 2,313
VEHICLE TRAVEL SPEED MEASUREMENTS
Page 1 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
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NB
Start 1 4 7 10 13 16 19 22 25 28 31 34 37 40 Time 3 6 9 12 15 18 21 24 27 30 33 36 39 999 Total
12/19/17 0 0 0 0 0 0 0 0 0 1 1 0 0 0 201:00 0 0 0 0 0 0 1 0 0 2 0 0 1 0 402:00 0 0 0 0 0 0 0 0 0 1 0 0 0 0 103:00 0 0 0 0 0 0 0 0 0 1 0 0 1 0 204:00 0 0 0 0 0 0 1 0 0 1 0 1 0 0 305:00 0 0 0 0 0 0 0 0 0 7 2 3 0 0 1206:00 1 0 0 0 0 0 1 2 3 8 7 2 0 0 2407:00 0 0 0 0 0 0 1 8 11 26 25 18 8 1 9808:00 0 0 0 0 0 0 0 2 11 16 33 11 6 1 8009:00 0 0 0 0 0 0 3 1 7 13 21 11 7 1 6410:00 0 0 0 0 0 0 2 1 3 13 10 8 4 2 4311:00 1 0 0 0 0 0 1 1 3 16 17 23 4 0 66
12 PM 2 0 0 0 0 0 0 3 9 20 34 14 6 0 8813:00 5 0 0 0 0 0 0 2 16 21 31 20 4 0 9914:00 3 0 0 0 0 0 0 6 6 18 24 20 3 2 8215:00 1 0 0 0 0 0 0 1 7 15 27 21 1 2 7516:00 0 0 0 0 0 1 1 9 12 18 29 16 6 2 9417:00 0 0 0 0 0 0 1 7 24 53 38 8 2 0 13318:00 2 0 0 0 2 0 3 13 26 27 10 7 0 0 9019:00 1 0 1 0 0 0 0 3 10 12 12 5 1 1 4620:00 0 0 0 0 0 1 0 0 7 12 4 1 1 0 2621:00 0 0 0 0 0 0 0 1 2 5 3 2 0 0 1322:00 0 0 0 0 0 0 0 0 1 3 2 0 0 0 623:00 0 0 0 0 0 0 0 0 0 3 11 1 1 0 16Total 16 0 1 0 2 2 15 60 158 312 341 192 56 12 1167
Daily 15th Percentile : 25 MPH
50th Percentile : 30 MPH85th Percentile : 34 MPH95th Percentile : 35 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 898Percent in Pace : 76.9%
Number of Vehicles > 30 MPH : 601Percent of Vehicles > 30 MPH : 51.5%
Page 2 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
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NB
Start 1 4 7 10 13 16 19 22 25 28 31 34 37 40 Time 3 6 9 12 15 18 21 24 27 30 33 36 39 999 Total
12/20/17 0 0 0 0 0 0 0 0 1 1 0 0 0 0 201:00 0 0 0 0 0 0 0 0 0 0 2 0 0 0 202:00 0 0 0 0 0 0 0 0 0 0 0 1 0 0 103:00 0 0 0 0 0 0 0 0 0 0 1 0 0 0 104:00 0 0 0 0 0 0 0 2 0 0 2 0 0 0 405:00 0 0 0 0 0 0 0 0 3 1 2 3 0 0 906:00 0 0 0 0 0 0 1 6 11 10 10 5 1 0 4407:00 2 0 0 0 0 0 0 0 5 27 26 20 4 0 8408:00 1 0 0 0 0 0 2 0 14 41 22 6 3 2 9109:00 0 0 0 0 1 1 1 3 8 9 21 14 8 1 6710:00 2 0 0 0 0 0 2 5 5 14 14 15 8 2 6711:00 1 0 0 0 0 1 0 7 4 21 24 16 6 3 83
12 PM 5 0 0 0 0 0 0 6 10 11 20 23 6 1 8213:00 4 0 0 0 0 1 1 11 9 15 21 10 2 3 7714:00 1 0 0 0 0 0 1 1 6 17 23 20 5 1 7515:00 0 0 0 0 0 0 0 3 9 18 31 18 9 2 9016:00 0 0 0 0 0 0 0 2 27 34 25 9 1 1 9917:00 1 0 0 1 1 3 0 12 22 40 30 8 2 0 12018:00 2 0 0 0 0 0 1 8 23 32 29 4 1 2 10219:00 1 0 0 0 0 0 0 1 12 16 11 3 2 0 4620:00 0 0 0 0 1 0 0 1 5 8 9 5 0 0 2921:00 0 0 0 0 0 0 2 4 0 6 1 1 1 0 1522:00 0 0 0 0 0 0 0 1 0 2 0 0 0 1 423:00 0 0 0 0 0 0 0 1 0 4 6 2 0 0 13Total 20 0 0 1 3 6 11 74 174 327 330 183 59 19 1207
Daily 15th Percentile : 25 MPH
50th Percentile : 29 MPH85th Percentile : 34 MPH95th Percentile : 35 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 898Percent in Pace : 74.4%
Number of Vehicles > 30 MPH : 591Percent of Vehicles > 30 MPH : 49.0%
Grand
Total36 0 1 1 5 8 26 134 332 639 671 375 115 31 2374
Overall 15th Percentile : 25 MPH
50th Percentile : 29 MPH85th Percentile : 34 MPH95th Percentile : 35 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 1796Percent in Pace : 75.7%
Number of Vehicles > 30 MPH : 1192Percent of Vehicles > 30 MPH : 50.2%
Page 3 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
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SB
Start 1 4 7 10 13 16 19 22 25 28 31 34 37 40 Time 3 6 9 12 15 18 21 24 27 30 33 36 39 999 Total
12/19/17 0 0 0 0 0 0 0 0 0 1 1 1 0 0 301:00 0 0 0 0 0 1 0 0 2 0 0 0 0 0 302:00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 003:00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 004:00 0 0 0 0 0 0 1 0 1 0 0 0 0 0 205:00 0 0 0 0 0 0 0 1 1 4 2 3 0 0 1106:00 0 0 0 0 0 0 0 1 7 20 27 16 2 2 7507:00 3 0 0 0 0 0 0 4 18 25 28 18 5 2 10308:00 0 0 0 0 0 0 0 2 8 21 23 8 7 0 6909:00 1 0 0 0 0 0 1 2 10 17 13 7 2 5 5810:00 0 0 0 0 0 0 1 2 5 7 15 7 2 0 3911:00 0 0 0 0 0 0 0 4 6 15 19 8 3 0 55
12 PM 5 0 0 1 0 0 0 5 6 15 20 15 4 2 7313:00 3 0 0 0 0 1 0 1 1 28 30 8 5 1 7814:00 1 0 0 0 0 0 0 3 4 24 28 13 6 0 7915:00 1 0 0 0 0 3 1 3 11 24 26 17 6 3 9516:00 1 0 0 0 0 0 1 0 8 17 24 14 1 1 6717:00 0 0 0 0 0 0 2 7 16 32 17 9 3 3 8918:00 0 0 0 0 0 1 0 7 5 28 22 4 4 1 7219:00 0 0 0 0 0 1 0 1 6 14 7 4 2 0 3520:00 0 0 0 0 0 0 1 2 3 16 14 4 2 0 4221:00 0 0 0 0 1 0 1 2 5 12 5 2 0 0 2822:00 0 0 0 0 0 0 1 0 0 4 2 5 1 0 1323:00 0 0 0 0 0 0 0 0 1 2 1 1 0 0 5Total 15 0 0 1 1 7 10 47 124 326 324 164 55 20 1094
Daily 15th Percentile : 25 MPH
50th Percentile : 30 MPH85th Percentile : 34 MPH95th Percentile : 36 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 855Percent in Pace : 78.2%
Number of Vehicles > 30 MPH : 563Percent of Vehicles > 30 MPH : 51.5%
Page 4 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
7829SPD1
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SB
Start 1 4 7 10 13 16 19 22 25 28 31 34 37 40 Time 3 6 9 12 15 18 21 24 27 30 33 36 39 999 Total
12/20/17 0 0 0 0 0 0 1 1 0 1 0 1 1 0 501:00 0 0 0 0 0 0 0 0 1 0 1 0 0 0 202:00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 003:00 0 0 0 0 0 0 0 0 0 0 0 0 0 1 104:00 0 0 0 0 0 0 0 1 3 0 0 0 0 0 405:00 0 0 0 0 0 0 0 0 2 1 2 2 2 0 906:00 0 0 0 0 0 0 1 1 17 23 24 9 4 2 8107:00 1 0 0 0 0 0 0 0 10 25 36 22 3 2 9908:00 0 0 0 0 0 0 3 4 6 15 23 17 6 0 7409:00 1 0 0 0 0 0 0 4 6 13 7 11 5 0 4710:00 0 0 0 0 0 0 0 0 7 9 13 8 3 2 4211:00 0 0 0 0 0 1 0 2 3 16 13 13 10 3 61
12 PM 1 0 0 0 1 0 1 2 6 21 19 28 8 0 8713:00 5 0 0 0 1 0 2 2 8 17 23 13 11 0 8214:00 2 0 0 0 0 1 0 4 12 24 22 18 6 1 9015:00 0 0 0 0 0 0 3 2 7 15 25 19 5 2 7816:00 0 0 0 0 0 0 1 2 10 29 28 17 3 2 9217:00 0 0 0 0 0 0 0 5 19 40 29 16 3 1 11318:00 1 0 0 0 0 0 1 1 10 20 24 11 1 1 7019:00 0 0 0 0 0 0 2 1 3 10 14 8 5 0 4320:00 0 0 0 0 0 0 0 1 4 17 9 3 1 0 3521:00 1 0 0 0 0 0 0 1 5 6 1 3 3 0 2022:00 0 0 0 0 0 0 1 0 1 5 4 5 0 0 1623:00 0 0 0 0 0 0 0 0 1 3 1 2 0 0 7Total 12 0 0 0 2 2 16 34 141 310 318 226 80 17 1158
Daily 15th Percentile : 26 MPH
50th Percentile : 30 MPH85th Percentile : 34 MPH95th Percentile : 36 MPH
Mean Speed(Average) : 31 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 901Percent in Pace : 77.8%
Number of Vehicles > 30 MPH : 641Percent of Vehicles > 30 MPH : 55.4%
Grand
Total27 0 0 1 3 9 26 81 265 636 642 390 135 37 2252
Overall 15th Percentile : 26 MPH
50th Percentile : 30 MPH85th Percentile : 34 MPH95th Percentile : 36 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 1756Percent in Pace : 78.0%
Number of Vehicles > 30 MPH : 1204Percent of Vehicles > 30 MPH : 53.5%
Page 5 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
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NB, SB
Start 1 4 7 10 13 16 19 22 25 28 31 34 37 40 Time 3 6 9 12 15 18 21 24 27 30 33 36 39 999 Total
12/19/17 0 0 0 0 0 0 0 0 0 2 2 1 0 0 501:00 0 0 0 0 0 1 1 0 2 2 0 0 1 0 702:00 0 0 0 0 0 0 0 0 0 1 0 0 0 0 103:00 0 0 0 0 0 0 0 0 0 1 0 0 1 0 204:00 0 0 0 0 0 0 2 0 1 1 0 1 0 0 505:00 0 0 0 0 0 0 0 1 1 11 4 6 0 0 2306:00 1 0 0 0 0 0 1 3 10 28 34 18 2 2 9907:00 3 0 0 0 0 0 1 12 29 51 53 36 13 3 20108:00 0 0 0 0 0 0 0 4 19 37 56 19 13 1 14909:00 1 0 0 0 0 0 4 3 17 30 34 18 9 6 12210:00 0 0 0 0 0 0 3 3 8 20 25 15 6 2 8211:00 1 0 0 0 0 0 1 5 9 31 36 31 7 0 121
12 PM 7 0 0 1 0 0 0 8 15 35 54 29 10 2 16113:00 8 0 0 0 0 1 0 3 17 49 61 28 9 1 17714:00 4 0 0 0 0 0 0 9 10 42 52 33 9 2 16115:00 2 0 0 0 0 3 1 4 18 39 53 38 7 5 17016:00 1 0 0 0 0 1 2 9 20 35 53 30 7 3 16117:00 0 0 0 0 0 0 3 14 40 85 55 17 5 3 22218:00 2 0 0 0 2 1 3 20 31 55 32 11 4 1 16219:00 1 0 1 0 0 1 0 4 16 26 19 9 3 1 8120:00 0 0 0 0 0 1 1 2 10 28 18 5 3 0 6821:00 0 0 0 0 1 0 1 3 7 17 8 4 0 0 4122:00 0 0 0 0 0 0 1 0 1 7 4 5 1 0 1923:00 0 0 0 0 0 0 0 0 1 5 12 2 1 0 21Total 31 0 1 1 3 9 25 107 282 638 665 356 111 32 2261
Daily 15th Percentile : 25 MPH
50th Percentile : 30 MPH85th Percentile : 34 MPH95th Percentile : 35 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 1753Percent in Pace : 77.5%
Number of Vehicles > 30 MPH : 1164Percent of Vehicles > 30 MPH : 51.5%
Page 6 Location : Foster StreetLocation : South of Mill RoadCity/State: Littleton, MA
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NB, SB
Start 1 4 7 10 13 16 19 22 25 28 31 34 37 40 Time 3 6 9 12 15 18 21 24 27 30 33 36 39 999 Total
12/20/17 0 0 0 0 0 0 1 1 1 2 0 1 1 0 701:00 0 0 0 0 0 0 0 0 1 0 3 0 0 0 402:00 0 0 0 0 0 0 0 0 0 0 0 1 0 0 103:00 0 0 0 0 0 0 0 0 0 0 1 0 0 1 204:00 0 0 0 0 0 0 0 3 3 0 2 0 0 0 805:00 0 0 0 0 0 0 0 0 5 2 4 5 2 0 1806:00 0 0 0 0 0 0 2 7 28 33 34 14 5 2 12507:00 3 0 0 0 0 0 0 0 15 52 62 42 7 2 18308:00 1 0 0 0 0 0 5 4 20 56 45 23 9 2 16509:00 1 0 0 0 1 1 1 7 14 22 28 25 13 1 11410:00 2 0 0 0 0 0 2 5 12 23 27 23 11 4 10911:00 1 0 0 0 0 2 0 9 7 37 37 29 16 6 144
12 PM 6 0 0 0 1 0 1 8 16 32 39 51 14 1 16913:00 9 0 0 0 1 1 3 13 17 32 44 23 13 3 15914:00 3 0 0 0 0 1 1 5 18 41 45 38 11 2 16515:00 0 0 0 0 0 0 3 5 16 33 56 37 14 4 16816:00 0 0 0 0 0 0 1 4 37 63 53 26 4 3 19117:00 1 0 0 1 1 3 0 17 41 80 59 24 5 1 23318:00 3 0 0 0 0 0 2 9 33 52 53 15 2 3 17219:00 1 0 0 0 0 0 2 2 15 26 25 11 7 0 8920:00 0 0 0 0 1 0 0 2 9 25 18 8 1 0 6421:00 1 0 0 0 0 0 2 5 5 12 2 4 4 0 3522:00 0 0 0 0 0 0 1 1 1 7 4 5 0 1 2023:00 0 0 0 0 0 0 0 1 1 7 7 4 0 0 20Total 32 0 0 1 5 8 27 108 315 637 648 409 139 36 2365
Daily 15th Percentile : 25 MPH
50th Percentile : 30 MPH85th Percentile : 34 MPH95th Percentile : 36 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 1799Percent in Pace : 76.1%
Number of Vehicles > 30 MPH : 1232Percent of Vehicles > 30 MPH : 52.1%
Grand
Total63 0 1 2 8 17 52 215 597 1275 1313 765 250 68 4626
Overall 15th Percentile : 25 MPH
50th Percentile : 30 MPH85th Percentile : 34 MPH95th Percentile : 36 MPH
Mean Speed(Average) : 30 MPH10 MPH Pace Speed : 27-36 MPH
Number in Pace : 3552Percent in Pace : 76.8%
Number of Vehicles > 30 MPH : 2396Percent of Vehicles > 30 MPH : 51.8%
MASSDOT INTERSECTION SPACING GUIDELINES
2006 EDITION
6-74 Intersection Design January 2006
6.8.2.1 Spacing Between Public Street Intersections Guidelines for spacing between public streets are given in Exhibit 6-34. In most situations, only a minimum spacing is recommended. However, for streets in urban areas, maximum spacings are also recommended to enable a proper density of connecting street network.
Exhibit 6-34 Intersection Space Guidelines
Source: Adapted from Congress for the New Urbanism (CNU), AASHTO, 2005
Frequently, intersection spacing is not a controllable element of intersection design, and the spacing is “given” as a fixed condition. In such circumstances, spacing guidelines are not applicable. However, in many situations, particularly involving areas of new development, intersection spacing is an important part of the context, and should be considered in light of the above guidelines.
