CMF / CRF Details

CMF ID: 11524

Conversion of stop-controlled intersection to mini roundabout

Description:

Prior Condition:  Two-way stop controlled (TWSC) intersection

Category: Intersection geometry

Study: Developing Crash Modification Factors for Mini-Roundabouts, Avelar et al., 2023

 
Star Quality Rating:4 Stars  [View score details]
Rating Points Total:115
Crash Modification Factor (CMF)
Value:0.5977
Adjusted Standard Error:
Unadjusted Standard Error:0.1462
Crash Reduction Factor (CRF)
Value:40.23  (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error:14.62
Applicability
Crash Type:All
Crash Severity:O (property damage only)
Roadway Types:Not specified
Street Type:Two-Way
Minimum Number of Lanes:1
Maximum Number of Lanes:3
Number of Lanes Direction:One Direction
Number of Lanes Comment:
Crash Weather:All
Road Division Type:All
Minimum Speed Limit:15
Maximum Speed Limit:50
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:No values chosen.
Traffic Control:Stop-controlled
Major Road Traffic Volume:Minimum of 643 to Maximum of 15138 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume:Minimum of 240 to Maximum of 9555 Annual Average Daily Traffic (AADT)
Average Major Road Volume :5589 Annual Average Daily Traffic (AADT)
Average Minor Road Volume :2222 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used:2003 to 2019
Municipality:
State:WA
Country:USA
Type of Methodology Used:
Other Details
Included in Highway Safety Manual?No
Date Added to Clearinghouse:Sep 30, 2024
Comments:CMF is presented in Table 18 in the report.