Study Details
Study Title: Accident Modification Factors for Traffic Engineering and ITS Improvements
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 |
|---|---|---|---|---|---|---|
| 0.71 | 29 | Cannot Be Rated (HSM) | Nighttime | K,A,B,C | All |
| 0.8 | 20 | Cannot Be Rated (HSM) | Nighttime | All | 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 |
|---|---|---|---|---|---|---|
| 0.01 | 99 |
|
Angle | All | Not specified | Urban |
| 0.99 | 1 |
|
All | 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 | Not specified | Urban |
Countermeasure: Install a traffic signal
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.56 [B] | 44 |
|
All | All | Not specified | Rural |
| 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 |
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 [°] | -18 | Cannot Be Rated (HSM) | All | Not Specified | 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 [°] | -12 | Cannot Be Rated (HSM) | All | Not Specified | 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 [°] | -9 | Cannot Be Rated (HSM) | All | Not Specified | 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 [°] | -5 | Cannot Be Rated (HSM) | All | Not Specified | 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 [°] | 6 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.9 [°] | 10 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 9 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.85 [°] | 15 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 12 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.79 [°] | 21 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 15 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.73 [°] | 27 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 5 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.92 [°] | 8 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:3H to 1V:5H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.92 [°] | 8 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.86 [°] | 14 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:3H to 1V:6H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.89 [°] | 11 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.81 [°] | 19 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:3H to 1V:7H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.85 [°] | 15 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.74 [°] | 26 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | Minor Arterial | Rural |
Countermeasure: Flatten sideslope from 1V:4H to 1V:5H
| CMF | CRF(%) | Quality | Crash Type | Crash Severity | Roadway Type | Area Type |
|---|---|---|---|---|---|---|
| 0.97 [°] | 3 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.94 [°] | 6 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 7 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.88 [°] | 12 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 11 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.81 [°] | 19 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 3 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.94 [°] | 6 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 8 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.86 [°] | 14 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | 5 | Cannot Be Rated (HSM) | All | Not Specified | Minor Arterial | Rural |
| 0.92 [°] | 8 | Cannot Be Rated (HSM) | Single vehicle | Not Specified | 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 [°] | -18 | Cannot Be Rated (HSM) | All | Not Specified | 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 [°] | -13 | Cannot Be Rated (HSM) | All | Not Specified | 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 [°] | -9 | Cannot Be Rated (HSM) | All | Not Specified | 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 [°] | -4 | Cannot Be Rated (HSM) | All | Not Specified | Principal Arterial Other | Rural |
