CMF / CRF Details
CMF ID: 4127
Increase lateral clearance from 10 to 40 feet
Description:
Lateral clearance is the distance from the roadside to nearby obstructions and fixed objects. The distance measured includes the shoulder, which is consistent with the definition of roadside clearance described by AASHTO.
Prior Condition: Increase lateral clearance from 10 feet to 40 feet on a rural, two-lane road. The CMF applies to single-vehicle crashes on tangent sections.
Category: Roadside
| Crash Modification Factor (CMF) |
|---|
| Value: | 0.68 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) |
|---|
| Value: | 32 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability |
|---|
| Crash Type: | Run off road,Single vehicle |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not Specified |
| Street Type: | |
| Minimum Number of Lanes: | 2 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | Undivided |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Rural |
| Traffic Volume: | Minimum of 3500 to Maximum of 3500 Average Daily Traffic (ADT) |
| Average Traffic Volume: | 3500 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: | |
| Average Major Road Volume : | |
| Average Minor Road Volume : | |
| Development Details |
|---|
| Date Range of Data Used: | 2003 to 2008 |
| Municipality: | |
| State: | TX |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 197 crashes |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 01, 2012 |
| Comments: | This CMF applies to single-vehicle run-off-road crashes on tangent sections of rural, two-lane roads. Additional CMFs could be derived from the analysis, but the authors only report the crash reduction for the following conditions: ADT of 3500 vehicles per day and change in lateral clearance from 10 to 40 feet. |
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