NH Route 28Corridor Safety AuditPreliminary Analysis of Historic and Existing Conditions
Road Safety Audits(23 CFR Part 924)Road Safety Audits means a formal safety performance examination of an existing or future road or intersection by an independent multidisciplinary audit team.Road Safety Audits are identified as a process for conducting engineering studies of hazardous locations, sections, and elements to develop highway safety improvement projects.
Background InformationCrash AnalysisVehicle Counts: Volume, Speed, ClassificationZoning and Land UseSign InventoryPavement EvaluationLOSVehicles, Bicycles, and Pedestrians
SR28 Preliminary Crash AnalysisSegmentsRate Quality ControlSegments with higher than average crash ratesIntersectionsEquivalent Property Damage OnlyEPDO Greater than 25BehavioralAggregate summary of crash records
Segments
Intersections
Background InformationCrash AnalysisVehicle Counts: Volume, Speed, ClassificationZoning and Land UseSign InventoryPavement EvaluationLOSVehicles, Bicycles, and Pedestrians
1 ALTON (South of Prospect Mountain High School)2 ALTON (South of Stockbridge Road)3 ALTON/BARNSTEAD town line4 BARNSTEAD (South of Peacham Road)5 BARNSTEAD (North of NH Route 126)6 BARNSTEAD (South of NH Route 126)7 PITTSFIELD (North of Leavitt Road)8 CHICHESTER (South of Webster Mills Road)9 CHICHESTER (South of Bear Hill Road)10 CHICHESTER (Main Street West of NH Route 28)11 EPSOM (North of Epsom Traffic Circle)12 EPSOM (South of Short Falls Road)Location Order
Sample of data collected for each location.
Sample of data collected for each location.
Chart3
0.0036162278
0.631935812
0.247824613
0.0179116284
0.0770708555
0.0216408634
Vehicle Classifications- NH 28 South of Prospect Mtn High School
SPEED
NH 28 SOUTH OF PROSPECT MOUNTAIN HIGH SCHOOL
POSTED SL= 50
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%TOTAL%>75
75
75
75
75
75
Corridor 85th Percentile Speed vs. Posted Speed Limits
Chart3
30
3050
50505353
5053
50
50
5055
55455353
4555
5558
5560
55
5540
4050
5055
55
5555
55
555055
5050
5035
3550
5056
50
50
----- Posted Speed Limit----- 85th Percentile
1 Prospect Mtn High School2 Stockbridge Rd3 Peacham Rd4 North of NH 1265 South of NH 1266 Webster Mills Rd7 Bear Hill Rd8 North of Epsom Traffic Circle9 Short Falls Rd
Alton Traffic Circle
Pembroke Town Line
Posted Speed Limit
Actual Speed
Distance (miles)
Speed (mph)
NH 28 Corridor Study Speed Data (Southbound)
1
2
3
4
5
6
7
8
9
Sheet1
SOUTHBOUND
SOUTHBOUND
posted speed limit85% percentilemi
03030030
11.35305013050
25050535325050
33.6950505353350
45050450
55050550
6505565055
75555535375545
88.6455584555
99.6855555858955
10555560601055
1155551155
1212.895540125540
1313.394050134050
1414.815050145055
1555551555
16555555551655
1755551755
1818.255505555185550
19505050501950
2020.45035205035
2121.13550213550
22505056562250
2350502350
2450502450
SOUTHBOUND2
NORTHBOUND0
1
posted speed limit85% percentile25353
05050353
150504
25050535
32.950356
43.6355075353
55050598
65.8505554958
755551060
855556011
99.2555012
10505013
1110.6504014
1211.1405515
1355551655
1455556017
155555591855
1655551950
1755505120
18505021
1950502256
20505023
2150505224
22505057
235035NORTHBOUND
243535050
150
250
35035
43550
550
65055
755
855
95550
1050
115040
124055
1355
1455
1555
1655
175550
1850
1950
2050
2150
2250
235035
2435
NORTHBOUND
0
1
253
3
4
559
654
7
860
9
10
11
12
13
1460
1559
16
1751
18
19
20
2152
2257
23
24
Sheet1
posted speed limit
85% percentile
Distance (miles)
Speed (mph)
NH 28 Corridor Study (Southbound)
Sheet2
----- Posted Speed Limit----- 85th Percentile
1 Prospect Mtn High School2 Stockbridge Rd3 Peacham Rd4 North of NH 1265 South of NH 1266 Webster Mills Rd7 Bear Hill Rd8 North of Epsom Traffic Circle9 Short Falls Rd
Alton Traffic Circle
Pembroke Town Line
Posted Speed Limit
Actual Speed
Distance (miles)
Speed (mph)
NH 28 Corridor Study Speed Data (Southbound)
2
1
3
4
5
7
6
8
9
Sheet3
----- Posted Speed Limit----- 85th Percentile
1 Short Falls Rd2 North of Epsom Traffic Circle3 Bear Hill Rd4 Webster Mills Rd5 South of NH 1266 North of NH 1267 Peacham Rd8 Stockbridge Rd9 Prospect Mtn High School
Alton Traffic Circle
Pembroke Town Line
Series11
Distance (miles)
Speed (mph)
NH 28 Corridor Study Speed Data (Northbound)
1
2
3
4
5
6
7
8
9
MBD0002BDBF.xls
Chart3
0.00399576920.0051907019
0.00799153840.0359963891
0.09025737450.233807267
0.29768480430.4454976303
0.60007051360.2849243963
NORTHBOUND
SOUTHBOUND
NH 28 South of Prospect Mountain High School
PMHS
NH 28 SOUTH OF PROSPECT MOUNTAIN HIGH SCHOOL
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
50 MPH510660.01%
TOTAL8862100.00%TOTAL8509100.00%
NH 28 SOUTH OF STOCKBRIDGE RD
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
50 MPH240313.30%
TOTAL18684100.00%TOTAL18061100.00%
NH 28 SOUTH OF PEACHAM RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH2081.31%
TOTAL16088100.00%TOTAL15837100.00%
NH 28 NORTH OF NH 126
POSTED SPEED LIMIT = 55 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
70 MPH2911.09%
TOTAL26733100.00%TOTAL26639100.00%
NH 28 SOUTH OF NH 126
POSTED SPEED LIMIT = 55 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
70 MPH2511.41%
TOTAL18118100.00%TOTAL17847100.00%
NH 28 VICINITY OF WEBSTER MILLS RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH6552.67%
TOTAL24912100.00%TOTAL24558100.00%
NH 28 VICINITY OF BEAR HILL RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH4841.94%
TOTAL25558100.00%TOTAL24927100.00%
MAIN ST (CHICHESTER) WEST OF NH 28
POSTED SPEED LIMIT = 35 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
50 MPH3541.66%
TOTAL22208100.00%TOTAL21283100.00%
NH 28 NORTH OF JCT US4/202/NH9
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH3401.44%
TOTAL23377100.00%TOTAL23551100.00%
NH 28 SOUTH OF SHORT FALLS RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH130.08%
TOTAL15886100.00%TOTAL15670100.00%
PMHS
00
00
00
00
00
NORTHBOUND
SOUTHBOUND
NH 28 South of Prospect Mountain High School
Sheet2
00
00
00
00
00
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 South of Stockbridge Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 South of Peacham Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 North of NH 126
0
0
0
0
0
0
0
0
0
0
NORTHBOUND
SOUTHBOUND
NH 28 South of NH 126
Sheet3
Southbound
Northbound
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 Vicinity of Webster Mills Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 Vicinity of Bear Hill Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
Main St. (Chichester) West of NH 28
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 North of Jct US 4/NH 9
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 South of Short Falls Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
Corridor 85th Percentile Speed vs. Posted Speed Limits
Chart4
50
50
5053
5035
3550
5059
505554
55
5560
5550
50
5040
4055
55
5560
5559
55
555051
50
50
50
5052
5057
5035
35
----- Posted Speed Limit----- 85th Percentile
1 Short Falls Rd2 North of Epsom Traffic Circle3 Bear Hill Rd4 Webster Mills Rd5 South of NH 1266 North of NH 1267 Peacham Rd8 Stockbridge Rd9 Prospect Mtn High School
Alton Traffic Circle
Pembroke Town Line
Series11
Distance (miles)
Speed (mph)
NH 28 Corridor Study Speed Data (Northbound)
1
2
3
4
5
6
7
8
9
Sheet1
SOUTHBOUND
SOUTHBOUND
posted speed limit85% percentilemi
03030030
11.35305013050
25050535325050
33.6950505353350
45050450
55050550
6505565055
75555535375545
88.6455584555
99.6855555858955
10555560601055
1155551155
1212.895540125540
1313.394050134050
1414.815050145055
1555551555
16555555551655
1755551755
1818.255505555185550
19505050501950
2020.45035205035
2121.13550213550
22505056562250
2350502350
2450502450
SOUTHBOUND2
NORTHBOUND0
1
posted speed limit85% percentile25353
05050353
150504
25050535
32.950356
43.6355075353
55050598
65.8505554958
755551060
855556011
99.2555012
10505013
1110.6504014
1211.1405515
1355551655
1455556017
155555591855
1655551950
1755505120
18505021
1950502256
20505023
2150505224
22505057
235035NORTHBOUND
243535050
150
250
35035
43550
550
65055
755
855
95550
1050
115040
124055
1355
1455
1555
1655
175550
1850
1950
2050
2150
2250
235035
2435
NORTHBOUND
0
1
253
3
4
559
654
7
860
9
10
11
12
13
1460
1559
16
1751
18
19
20
2152
2257
23
24
Sheet1
posted speed limit
85% percentile
Distance (miles)
Speed (mph)
NH 28 Corridor Study (Southbound)
Sheet2
----- Posted Speed Limit----- 85th Percentile
1 Prospect Mtn High School2 Stockbridge Rd3 Peacham Rd4 North of NH 1265 South of NH 1266 Webster Mills Rd7 Bear Hill Rd8 North of Epsom Traffic Circle9 Short Falls Rd
Alton Traffic Circle
Pembroke Town Line
Posted Speed Limit
Actual Speed
Distance (miles)
Speed (mph)
NH 28 Corridor Study Speed Data (Southbound)
2
1
3
4
5
7
6
8
9
Sheet3
----- Posted Speed Limit----- 85th Percentile
1 Short Falls Rd2 North of Epsom Traffic Circle3 Bear Hill Rd4 Webster Mills Rd5 South of NH 1266 North of NH 1267 Peacham Rd8 Stockbridge Rd9 Prospect Mtn High School
Alton Traffic Circle
Pembroke Town Line
Series11
Distance (miles)
Speed (mph)
NH 28 Corridor Study Speed Data (Northbound)
1
2
3
4
5
6
7
8
9
MBD0002BDBF.xls
Chart3
0.00399576920.0051907019
0.00799153840.0359963891
0.09025737450.233807267
0.29768480430.4454976303
0.60007051360.2849243963
NORTHBOUND
SOUTHBOUND
NH 28 South of Prospect Mountain High School
PMHS
NH 28 SOUTH OF PROSPECT MOUNTAIN HIGH SCHOOL
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
50 MPH510660.01%
TOTAL8862100.00%TOTAL8509100.00%
NH 28 SOUTH OF STOCKBRIDGE RD
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
50 MPH240313.30%
TOTAL18684100.00%TOTAL18061100.00%
NH 28 SOUTH OF PEACHAM RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH2081.31%
TOTAL16088100.00%TOTAL15837100.00%
NH 28 NORTH OF NH 126
POSTED SPEED LIMIT = 55 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
70 MPH2911.09%
TOTAL26733100.00%TOTAL26639100.00%
NH 28 SOUTH OF NH 126
POSTED SPEED LIMIT = 55 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
70 MPH2511.41%
TOTAL18118100.00%TOTAL17847100.00%
NH 28 VICINITY OF WEBSTER MILLS RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH6552.67%
TOTAL24912100.00%TOTAL24558100.00%
NH 28 VICINITY OF BEAR HILL RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH4841.94%
TOTAL25558100.00%TOTAL24927100.00%
MAIN ST (CHICHESTER) WEST OF NH 28
POSTED SPEED LIMIT = 35 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
50 MPH3541.66%
TOTAL22208100.00%TOTAL21283100.00%
NH 28 NORTH OF JCT US4/202/NH9
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH3401.44%
TOTAL23377100.00%TOTAL23551100.00%
NH 28 SOUTH OF SHORT FALLS RD
POSTED SPEED LIMIT = 50 MPH
SOUTHBOUNDNORTHBOUND
TOTAL%TOTAL%
65 MPH130.08%
TOTAL15886100.00%TOTAL15670100.00%
PMHS
00
00
00
00
00
NORTHBOUND
SOUTHBOUND
NH 28 South of Prospect Mountain High School
Sheet2
00
00
00
00
00
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 South of Stockbridge Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 South of Peacham Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 North of NH 126
0
0
0
0
0
0
0
0
0
0
NORTHBOUND
SOUTHBOUND
NH 28 South of NH 126
Sheet3
Southbound
Northbound
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 Vicinity of Webster Mills Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 Vicinity of Bear Hill Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
Main St. (Chichester) West of NH 28
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 North of Jct US 4/NH 9
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
NORTHBOUND
SOUTHBOUND
NH 28 South of Short Falls Rd.
0
0
0
0
0
0
0
0
0
0
Southbound
Northbound
Background InformationCrash AnalysisVehicle Counts: Volume, Speed, ClassificationZoning and Land UseSign InventoryPavement EvaluationLOSVehicles, Bicycles, and Pedestrians
Background InformationCrash AnalysisVehicle Counts: Volume, Speed, ClassificationZoning and Land UseSign InventoryPavement EvaluationLOSVehicles, Bicycles, and Pedestrians
Background InformationCrash AnalysisVehicle Counts: Volume, Speed, ClassificationZoning and Land UseSign InventoryPavement EvaluationLOSVehicles, Bicycles, and Pedestrians
Background InformationCrash AnalysisTraffic VolumeSpeed StudyVehicle Classification CountsZoning and Land UseSign InventoryPavement EvaluationLOSVehicles, Bicycles, and Pedestrians
Next StepsObtain Crash Records for Identified Intersections
Behavioral AnalysisCrash Summary
Additional data collection may be requiredSign Retro-reflectivityTurning Movement Counts at specific locationsAdditional Speed Counts to fill in data gaps
Next Steps - continuedRoad Safety Audit & Crash Reduction Factor TrainingManchester Community CollegeMarch 3rd and 4th 2009
Conduct Road Safety Audit Recommend Cost Effective Improvements
Project Timeline
*Colored segments have a higher than average crash rate. There is some overlap between intersections and segments.*Intersections identified have an Equivalent Property Damage Only in excess of 25. The formula is for is EPDO = Fatal*12 +Injuries*5+PDO*1*Training will include Road Safety Audits and Crash Reduction Factors.*Training will include Road Safety Audits and Crash Reduction Factors.