CMF / CRF Details

CMF ID: 11236

Install adaptive traffic signal control

Description: ATSC is a traffic management strategy in which traffic signal timings change, or adapt, based on observed traffic demand. These systems utilize increased detection to continually collect data on observed demand, and signal timings are then re-optimized based on current data.

Prior Condition:  Signalized Intersections without Adaptive Signal Control Technology (ASCT)

Category: Intersection traffic control

Study: Safety Evaluation of an Adaptive Signal Control Technology Using an Empirical Bayes Approach, Kodi et al., 2022

Star Quality Rating:4 Stars  [View score details]
Rating Points Total:130
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.007
Crash Reduction Factor (CRF)
Value:4.2  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:0.7
Crash Type:All
Crash Severity:K (fatal),A (serious injury),B (minor injury),C (possible injury)
Roadway Types:All
Street Type:Two-Way
Minimum Number of Lanes:
Maximum Number of Lanes:
Number of Lanes Direction:Both Directions
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:
Minimum Speed Limit:
Maximum Speed Limit:
Speed Unit:mph
Speed Limit Comment:
Area Type:Urban and suburban
Traffic Volume:
Average Traffic Volume:
Time of Day:All
If countermeasure is intersection-based
Intersection Type:Roadway/roadway (not interchange related)
Intersection Geometry:3-leg,4-leg
Traffic Control:Signalized
Major Road Traffic Volume:Minimum of 11028 to Maximum of 64500 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 1753 to Maximum of 46500 Annual Average Daily Traffic (AADT)
Average Major Road Volume :37550 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :13550 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2011 to 2018
Municipality:Seminole County and Orange County
Type of Methodology Used:
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Dec 06, 2022
Comments:The number of Before and After Crashes/Year for Treatment Intersections is presented in Table 4 in the paper. However, this information was not disaggregated at the intersection level to distinguish between the varying Before and After periods at intersections leading to the number of crashes in the Before and After being recorded as unknown.