CMF / CRF Details
Convert signalized intersection to modern roundabout
Countermeasure ID: 4253
Description:
Prior Condition: Signalized intersection
Category: Intersection geometry
Study: Evaluation of Safety Strategies at Signalized Intersections, Srinivasan, et al., 2011
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 125 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 0.342 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 0.058 |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | 65.8 (This value indicates a decrease in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | 5.8 |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | K (fatal),A (serious injury),B (minor injury),C (possible injury) |
| Roadway Types: | Not specified |
| Street Type: | |
| Minimum Number of Lanes: | 1 |
| Maximum Number of Lanes: | 2 |
| Number of Lanes Direction: | |
| Number of Lanes Comment: | |
| Crash Weather: | Not specified |
| Road Division Type: | |
| Minimum Speed Limit: | |
| Maximum Speed Limit: | |
| Speed Unit: | |
| Speed Limit Comment: | |
| Area Type: | Urban and suburban |
| Traffic Volume: | |
| Average Traffic Volume: | |
| Time of Day: | Not specified |
| If countermeasure is intersection-based | |
| Intersection Type: | Roadway/roadway (not interchange related) |
| Intersection Geometry: | 3-leg,4-leg |
| Traffic Control: | Roundabout |
| Major Road Traffic Volume: | Minimum of 5322 to Maximum of 43123 Annual Average Daily Traffic (AADT) |
| Minor Road Traffic Volume: | |
| Average Major Road Volume : | 18529 Annual Average Daily Traffic (AADT) |
| Average Minor Road Volume : | |
| Development Details | |
|---|---|
| Date Range of Data Used: | 1999 to 2009 |
| Municipality: | |
| State: | CO,FL,IN,MD,MI,NY,NC,SC,VT,WA |
| Country: | USA |
| Type of Methodology Used: | Before/after using empirical Bayes or full Bayes |
| Sample Size (sites): | 28 sites after |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Dec 06, 2012 |
| Comments: | Countermeasure name has been slightly modified for consistency across Clearinghouse |
