CMF / CRF Details
CMF ID: 8334
Install an additional lane
Description: Use reducing lane and shoulder width to install additional lanes for urban freeway
Prior Condition: Freeway with fewer lanes
Category: Roadway
| Crash Modification Factor (CMF) |
| Value: |
0.76
|
| Adjusted Standard Error: |
|
| Unadjusted Standard Error: |
0.092 |
| Crash Reduction Factor (CRF) |
| Value: |
24 (This value indicates a decrease in crashes)
|
| Adjusted Standard Error: |
|
| Unadjusted Standard Error: |
9.2 |
| Applicability |
| Crash Type: |
All |
| Crash Severity: |
K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: |
Principal Arterial Other Freeways and Expressways |
| Number of Lanes: |
2-5 |
| Road Division Type: |
Divided by Median |
| Speed Limit: |
>50 |
| Area Type: |
Urban |
| Traffic Volume: |
Minimum of 200 to Maximum of 281450 Average Daily Traffic (ADT)
|
| Time of Day: |
All |
| If countermeasure is intersection-based |
| Intersection Type: |
|
| Intersection Geometry: |
|
| Traffic Control: |
|
| Major Road Traffic Volume: |
|
| Minor Road Traffic Volume: |
|
| Development Details |
| Date Range of Data Used: |
2010 to 2013 |
| Municipality: |
Dallas, Houston, San Antonio |
| State: |
TX |
| Country: |
USA |
| Type of Methodology Used: |
Regression cross-section |
| Sample Size (crashes): |
407 crashes |
| Sample Size (sites): |
536 sites |
| Sample Size (site-years): |
2104 site-years |
| Other Details |
| Included in Highway Safety Manual? |
No |
| Date Added to Clearinghouse: |
Jan-17-2017 |
| Comments: |
CMF applies to adding one additional lane with 11 ft average lane width |
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