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.