CMF / CRF Details

CMF ID: 11030

Install an Adaptive Signal Control Systems (ASCS)

Description: There are three main components in the ASCS: the vehicle detection, local traffic controller(s), and central server.

Prior Condition: Freeways with non-ASCS alternate routes

Category: Advanced technology and ITS

Study: Assessing the likelihood of secondary crashes on freeways with Adaptive Signal Control System deployed on alternate routes, Salek et al., 2021

Star Quality Rating: 2 Stars   [View score details]
Rating Points Total: 65
Crash Modification Factor (CMF)
Value: 0.527
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Reduction Factor (CRF)
Value: 47.3   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:
Crash Type: Other
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:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:
Speed Limit Comment:
Area Type:
Traffic Volume:
Average Traffic Volume: 149852 Annual Average Daily Traffic (AADT)
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:
Municipality: Charleston
State: SC
Country: USA
Type of Methodology Used:
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Mar-16-2022
Comments: CMF of secondary crashes. The CMF here is for changes in odds ratio.