CMF / CRF Details

CMF ID: 3138

Convert two-way (without flashing beacons) to all-way stop control (with flashing beacons)

Description: Conversion from two-way stop sign control without flashing beacons to all-way stop sign control with flashing beacons.

Prior Condition:  Two-way stop sign control without flashing beacons.

Category: Intersection traffic control

Study: Evaluation of the Conversion from Two-Way Stop Sign Control to All-Way Stop Sign Control at 53 Locations in North Carolina, Simpson and Hummer, 2010

Star Quality Rating:3 Stars  [View score details]
Rating Points Total:85
Crash Modification Factor (CMF)
Adjusted Standard Error:
Unadjusted Standard Error:0.033
Crash Reduction Factor (CRF)
Value:85.7  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:3.3
Crash Type:Angle,Head on,Left turn,Right turn
Crash Severity:All
Roadway Types:All
Street Type:
Minimum Number of Lanes:1
Maximum Number of Lanes:1
Number of Lanes Direction:
Number of Lanes Comment:
Crash Weather:Not specified
Road Division Type:Undivided
Minimum Speed Limit:35
Maximum Speed Limit:55
Speed Unit:mph
Speed Limit Comment:
Area Type:All
Traffic Volume:
Average Traffic Volume:
Time of Day:Not specified
If countermeasure is intersection-based
Intersection Type:
Intersection Geometry:4-leg
Traffic Control:Stop-controlled
Major Road Traffic Volume:Minimum of 1340 to Maximum of 9900
Minor Road Traffic Volume:Minimum of 1340 to Maximum of 9900
Average Major Road Volume :
Average Minor Road Volume :
Development Details
Date Range of Data Used:1990 to 2009
Type of Methodology Used:Before/after using empirical Bayes or full Bayes
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Jul 15, 2011