CMF / CRF Details
CMF ID: 2375
Install curb and gutter
Description: Install AASHTO Type B curb along the outside (right) shoulder of four-lane suburban roadways.
Prior Condition: Suburban four-lane facilities without curb on the outside (right) shoulder. All roads have either two-way left-turn lanes or non-traversable medians.
Category: Shoulder treatments
Study: Collision Models for Multilane Highway Segments to Examine the Safety of Curbs, Baek and Hummer, 2008
Star Quality Rating: | [View score details] |
Rating Points Total: | 110 |
Crash Modification Factor (CMF) | |
---|---|
Value: | 0.89 |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Crash Reduction Factor (CRF) | |
---|---|
Value: | 11 (This value indicates a decrease in crashes) |
Adjusted Standard Error: | |
Unadjusted Standard Error: |
Applicability | |
---|---|
Crash Type: | All |
Crash Severity: | All |
Roadway Types: | Not Specified |
Street Type: | |
Minimum Number of Lanes: | 4 |
Maximum Number of Lanes: | 4 |
Number of Lanes Direction: | |
Number of Lanes Comment: | |
Crash Weather: | Not specified |
Road Division Type: | Divided by Median |
Minimum Speed Limit: | 45 |
Maximum Speed Limit: | 55 |
Speed Unit: | mph |
Speed Limit Comment: | |
Area Type: | Suburban |
Traffic Volume: | Minimum of 8333 to Maximum of 57138 |
Average Traffic Volume: | |
Time of Day: | All |
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: | 2001 to 2003 |
Municipality: | |
State: | NC |
Country: | |
Type of Methodology Used: | Regression cross-section |
Sample Size (crashes): | 2274 crashes |
Other Details | |
---|---|
Included in Highway Safety Manual? | No |
Date Added to Clearinghouse: | Jan 01, 1970 |
Comments: |