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 5 Stars Angle All Not specified Urban
0.99 1 3 Stars 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 2 Stars 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 5 Stars All All Not specified Rural
0.23 [B] 77 5 Stars Angle All Not Specified Rural
0.4 [B] 60 4 Stars Left turn All Not Specified Rural
1.58 [I] -58 4 Stars 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 3 Stars Angle,Nighttime All Not specified Urban
0.65 35 3 Stars 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