Study Details
Accident Modification Factors for Traffic Engineering and ITS Improvements
Study ID: 22
Authors: Harkey et al.
Publication Date: 2008
Abstract:
Study Citation: Harkey, D.L., R. Srinivasan, J. Baek, F. Council, K. Eccles, N. Lefler, F. Gross, B. Persaud, C. Lyon, E. Hauer, and J. Bonneson. National Cooperative Highway Research Report 617: Accident Modification Factors for Traffic Engineering and ITS Improvements, NCHRP, Transportation Research Board, Washington, DC, 2008.
Study Report: Download the Study Report Document
CMFs Associated With This Study
Category: Highway lighting
Countermeasure: Provide highway lighting
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.8 | 20 | Cannot Be Rated (HSM) | Nighttime | All | All |
| 0.71 | 29 | Cannot Be Rated (HSM) | Nighttime | K,A,B,C | All |
Category:Intersection traffic control
Countermeasure: Change from permitted or permitted-protected to protected
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.99 | 1 |  | All | All | Not specified | Urban |
| 0.01 | 99 |  | Angle | All | Not specified | Urban |
Countermeasure: Change permitted to protected/permitted or permitted/protected
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.98 | 2 | | Angle | Not specified | Urban |
Countermeasure: Install a traffic signal
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.23[B] | 77 |  | Angle | All | Not Specified | Rural |
| 0.4[B] | 60 | | Left turn | All | Not Specified | Rural |
| 1.58[I] | -58 | | Rear end | All | Not specified | Rural |
| 0.56[B] | 44 | | All | All | Not specified | Rural |
Countermeasure: Replace Night-Time Flash with Steady Operation
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.66 | 34 | | Angle,Nighttime | All | Not specified | Urban |
| 0.65 | 35 | | Nighttime | All | Not specified | Urban |
Category:Roadside
Countermeasure: Convert sideslope from 1V:7H to 1V:2H or steeper
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.18[#chr(176)#] | -18 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
Countermeasure: Convert sideslope from 1V:7H to 1V:4H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.12[#chr(176)#] | -12 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
Countermeasure: Convert sideslope from 1V:7H to 1V:5H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.09[#chr(176)#] | -9 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
Countermeasure: Convert sideslope from 1V:7H to 1V:6H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.05[#chr(176)#] | -5 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
Countermeasure: Flatten sideslope from 1V:2H to 1V:4H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.94[#chr(176)#] | 6 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.9[#chr(176)#] | 10 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:2H to 1V:5H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.91[#chr(176)#] | 9 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.85[#chr(176)#] | 15 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:2H to 1V:6H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.88[#chr(176)#] | 12 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.79[#chr(176)#] | 21 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:2H to 1V:7H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.85[#chr(176)#] | 15 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.73[#chr(176)#] | 27 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:3H to 1V:4H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.95[#chr(176)#] | 5 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.92[#chr(176)#] | 8 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:3H to 1V:5H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.86[#chr(176)#] | 14 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
| 0.92[#chr(176)#] | 8 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:3H to 1V:6H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.81[#chr(176)#] | 19 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
| 0.89[#chr(176)#] | 11 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:3H to 1V:7H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.74[#chr(176)#] | 26 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
| 0.85[#chr(176)#] | 15 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:4H to 1V:5H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.94[#chr(176)#] | 6 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
| 0.97[#chr(176)#] | 3 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:4H to 1V:6H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.93[#chr(176)#] | 7 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.88[#chr(176)#] | 12 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:4H to 1V:7H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.89[#chr(176)#] | 11 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.81[#chr(176)#] | 19 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:5H to 1V:6H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.97[#chr(176)#] | 3 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.94[#chr(176)#] | 6 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:5H to 1V:7H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.92[#chr(176)#] | 8 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.86[#chr(176)#] | 14 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:6H to 1V:7H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.95[#chr(176)#] | 5 | Cannot Be Rated (HSM) | All | Minor Arterial | Rural |
| 0.92[#chr(176)#] | 8 | Cannot Be Rated (HSM) | Single vehicle | Minor Arterial | Rural |
Category:Shoulder treatments
Countermeasure: Convert right shoulder width from 8-ft to 0-ft
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.18[#chr(176)#] | -18 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
Countermeasure: Convert right shoulder width from 8-ft to 2-ft
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.13[#chr(176)#] | -13 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
Countermeasure: Convert right shoulder width from 8-ft to 4-ft
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.09[#chr(176)#] | -9 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
Countermeasure: Convert right shoulder width from 8-ft to 6-ft
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 1.04[#chr(176)#] | -4 | Cannot Be Rated (HSM) | All | Principal Arterial Other | Rural |
