CMF / CRF Details

CMF ID: 5214

Modify lane width on rural frontage road

Description: Frontage road are roads between successive interchanges and have restricted access along one side of the road, a higher percentage of turning traffic, and periodic ramp-frontage-road terminals with yield control.

Prior Condition: No Prior Condition(s)

Category: Roadway

Study: Development of Accident Modification Factors for Rural Frontage Road Segments in Texas, Lord and Bonneson, 2007

Star Quality Rating: Cannot Be Rated (HSM)
Rating Points Total:
Crash Modification Factor (CMF)
Value: Equation
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: All
Crash Severity: All
Roadway Types: Minor Collector
Street Type:
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather: Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type: Rural
Traffic Volume: Minimum of 100 to Maximum of 6200 Annual Average Daily Traffic (AADT)
Average Traffic Volume:
Time of Day:
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:
Traffic Control:
Major Road Traffic Volume:
Minor Road Traffic Volume:
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:
State: TX
Type of Methodology Used: Not specified
Other Details
Included in Highway Safety Manual? Yes
Date Added to Clearinghouse: Mar-22-2013
Comments: HSM 1st Ed, page 13-9. Both one-way and two-way frontage roads were considered in the development of this CMF. Development of this CMF was limited to lane widths ranging from 9 to 12 ft.