CMF / CRF Details
Increasing the outside shoulder width inside the work zone by one foot
Countermeasure ID: 4521
Description: Increasing the outside shoulder width inside the work zone by one foot
Prior Condition: Regular traffic conditions without work zone
Category: Work zone
Study: Improving Safety in High-Speed Work Zones: A Super 70 Study, Tarko, Andrew P.; Bin Islam, Mouyid ; Thomaz, Jose E., 2011
| Crash Modification Factor (CMF) |
|---|
| Value: | 1.043 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.02 |
| Crash Reduction Factor (CRF) |
|---|
| Value: | -4.3 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 2 |
| Applicability |
|---|
| Crash Type: | Single vehicle |
| Crash Severity: | All |
| Roadway Types: | Principal Arterial Interstate |
| 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: | Divided by Median |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| 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: | 2006 to 2008 |
| Municipality: | Indianapolis |
| State: | IN |
| Country: | USA |
| Type of Methodology Used: | Regression cross-section |
| Sample Size (crashes): | 373 crashes |
| Other Details |
|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 06, 2012 |
| Comments: | CMF identified from Appendix I |
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