CMF / CRF Details
CMF ID: 11139
Coordinated Ramp Metering
Description:
Prior Condition: Ramp without ramp metering
Category: Advanced technology and ITS
Study: Before-After Safety Evaluation of Coordinated Ramp Metering System using Empirical Bayes Approach: A Case Study on I-80 in California, Amirarsalan Mehrara Molan, Anurag Pande, and Stuart Madison Harvey, 2022
| Star Quality Rating: |  [View score details] |
| Rating Points Total: | 85 |
| Crash Modification Factor (CMF) | |
|---|---|
| Value: | 1.12 |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Crash Reduction Factor (CRF) | |
|---|---|
| Value: | -12 (This value indicates an increase in crashes) |
| Adjusted Standard Error: | |
| Unadjusted Standard Error: | |
| Applicability | |
|---|---|
| Crash Type: | All |
| Crash Severity: | O (property damage only) |
| Roadway Types: | Principal Arterial Interstate |
| Street Type: | Two-Way |
| Minimum Number of Lanes: | 8 |
| Maximum Number of Lanes: | 10 |
| Number of Lanes Direction: | Both Directions |
| 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: | Not specified |
| Traffic Volume: | |
| Average Traffic Volume: | 187173 Annual Average Daily Traffic (AADT) |
| 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: | 2012 to 2019 |
| Municipality: | |
| State: | CA |
| Country: | |
| Type of Methodology Used: | |
| Other Details | |
|---|---|
| Included in Highway Safety Manual? | No |
| Date Added to Clearinghouse: | Aug 25, 2022 |
| Comments: | This is the CMF for the entire corridor PDO crashes. |
