CMF / CRF Details
Install automated section speed enforcement system
Countermeasure ID: 9143
Description: Installation of automated speed enforcement system. Determines average speed of vehicle over a long distance.
Prior Condition: Fixed Speed Cameras (FCS) for speed at a specific point, converted to Average Speed Control (ASC)
Category: Advanced technology and ITS
Study: Safety Impact of Average Speed Control in the UK, Lahrmann et al., 2016
Image: View the countermeasure image.
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 30 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.3 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.11 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 70 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 11 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury) |
| Roadway Types: | Principal Arterial Other Freeways and Expressways |
| 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: | 70 |
| Maximum Speed Limit: | 70 |
| Speed Unit: | mph |
| Speed Limit Comment: | |
| Area Type: | All |
| Traffic Volume: | |
| 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: | 2004 to 2010 |
| Municipality: | Cambridge and Huntingdon |
| State: | notusa |
| Country: | United Kingdom |
| Type of Methodology Used: | Simple before/after |
| Sample Size (crashes): | 43 crashes before, 16 crashes after |
| Sample Size (sites): | 6 sites before, 6 sites after |
| Sample Size (site-years): | 18 site-years before, 18 site-years after |
| Sample Size (miles): | 8.7 miles before, 8.7 miles after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Jan 17, 2018 |
| Comments: | |
