CMF / CRF Details
CMF ID: 4082
Install periodic passing lanes on rural two-lane highways
Description: Install periodic passing lanes on rural two-lane highways to allow passing of slower vehicles and the dispersal of traffic platoons
Prior Condition: Two-lane rural highway with no passing lane
Category: Roadway
Study: Safety Effectiveness of Super 2 Highways in Texas, Park et al., 2012
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 140 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.65 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.11 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 35 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 11 |
| Applicability | |
|---|---|
| Crash Type: | Non-intersection |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Principal Arterial Other |
| 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 1655 to Maximum of 7031 Annual Average Daily Traffic (AADT) |
| 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: | 1997 to 2009 |
| Municipality: | |
| State: | TX |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (crashes): | 148 crashes before, 40 crashes after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Nov 01, 2012 |
| Comments: | |
