Study Details
Study Title: Crash Reduction Factors for Traffic Engineering and ITS Improvements
Authors: Harkey et al.
Publication Date: 2008
Abstract:
Study Citation: Harkey, D.L., R. Srinivasan, J. Baek, B. Persaud, C. Lyon, F.M. Council, K. Eccles, N. Lefler, F. Gross, E. Hauer, J. Bonneson, "Crash Reduction Factors for Traffic Engineering and ITS Improvements", NCHRP Project 17-25 Final Report, Washington, D.C., National Cooperative Highway Research Program, Transportation Research Board, (2008)
CMFs Associated With This Study
Category: Access management
Countermeasure: 10-ft to 100-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.35 | 65 |  | Cross median | | Not specified | Urban |
| 0.36 | 64 | | Cross median | | Not specified | Urban |
| 0.22 | 78 | | Cross median | | Not specified | Rural |
| 0.25 | 75 | | Cross median | | Not specified | Rural |
| 0.3 | 70 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 20-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.86 | 14 | | Cross median | | Not specified | Rural |
| 0.84 | 16 | | Cross median | | Not specified | Rural |
| 0.89 | 11 | | Cross median | | Not specified | Urban |
| 0.89 | 11 | | Cross median | | Not specified | Urban |
| 0.87 | 13 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 30-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.71 | 29 | | Cross median | | Not specified | Rural |
| 0.74 | 26 | | Cross median | | Not specified | Rural |
| 0.8 | 20 | | Cross median | | Not specified | Urban |
| 0.79 | 21 | | Cross median | | Not specified | Urban |
| 0.76 | 24 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 40-ft converstion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.67 | 33 | | Cross median | | Not specified | Urban |
| 0.63 | 37 | | Cross median | | Not specified | Rural |
| 0.6 | 40 | | Cross median | | Not specified | Rural |
| 0.71 | 29 | | Cross median | | Not specified | Urban |
| 0.71 | 29 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 50-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.59 | 41 | | Cross median | | Not specified | Urban |
| 0.54 | 46 | | Cross median | | Not specified | Rural |
| 0.51 | 49 | | Cross median | | Not specified | Rural |
| 0.64 | 36 | | Cross median | | Not specified | Urban |
| 0.63 | 37 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 60-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.46 | 54 | | Cross median | | Not specified | Rural |
| 0.43 | 57 | | Cross median | | Not specified | Rural |
| 0.57 | 43 | | Cross median | | Not specified | Urban |
| 0.56 | 44 | | Cross median | | Not specified | Urban |
| 0.51 | 49 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 70-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.4 | 60 | | Cross median | | Not specified | Rural |
| 0.36 | 64 | | Cross median | | Not specified | Rural |
| 0.51 | 49 | | Cross median | | Not specified | Urban |
| 0.5 | 50 | | Cross median | | Not specified | Urban |
| 0.45 | 55 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 80-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.34 | 66 | | Cross median | | Not specified | Rural |
| 0.31 | 69 | | Cross median | | Not specified | Rural |
| 0.45 | 55 | | Cross median | | Not specified | Urban |
| 0.39 | 61 | | Cross median | | Not specified | Urban |
| 0.46 | 54 | | Cross median | | Not specified | Urban |
Countermeasure: 10-ft to 90-ft conversion (median width)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.29 | 71 | | Cross median | | Not specified | Rural |
| 0.26 | 74 | | Cross median | | Not specified | Rural |
| 0.41 | 59 | | Cross median | | Not specified | Urban |
| 0.34 | 66 | | Cross median | | Not specified | Urban |
| 0.4 | 60 | | Cross median | | Not specified | Urban |
Category:Roadway
Countermeasure: Increased pavement friction
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.43 | 57 | | Wet road | All | All | All |
| 0.7 | 30 | | Single vehicle | All | All | All |
Countermeasure: Road diet (Convert 4-lane undivided road to 2-lanes plus turning lane)
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|
| 0.71[B] | 29 | | All | All | Minor Arterial | Urban |
