CMF / CRF Details

CMF ID: 8218

Install pedestrian countdown timer

Description: Install pedestrian countdown timer

Prior Condition: Intersections without pedestrian countdown signals

Category: Intersection traffic control

Study: Evaluating Effectiveness of Pedestrian Countdown Signals on Safety of Older Drivers, Kwigizile et al., 2016

Star Quality Rating: 4 Stars   [View score details]
Crash Modification Factor (CMF)
Value: 0.85
Adjusted Standard Error:
Unadjusted Standard Error: 0.092
Crash Reduction Factor (CRF)
Value: 15   (This value indicates a decrease in crashes)
Adjusted Standard Error:
Unadjusted Standard Error: 9.2
Crash Type: Other
Crash Severity: All
Roadway Types: Not specified
Number of Lanes: 1-10
Road Division Type: All
Speed Limit:
Area Type: Not specified
Traffic Volume:
Time of Day: All
If countermeasure is intersection-based
Intersection Type: Not specified
Intersection Geometry: Not specified
Traffic Control: Signalized
Major Road Traffic Volume: Minimum of 1637 to Maximum of 70100 Annual Average Daily Traffic (AADT)
Minor Road Traffic Volume: Minimum of 730 to Maximum of 35214 Annual Average Daily Traffic (AADT)
Development Details
Date Range of Data Used: 2004 to 2013
State: MI
Type of Methodology Used: Before/after using comparison group
Sample Size (crashes): 331 crashes before, 289 crashes after
Sample Size (sites): 93 sites before, 93 sites after
Sample Size (site-years): 279 site-years before, 279 site-years after
Other Details
Included in Highway Safety Manual? No
Date Added to Clearinghouse: Jan-17-2017
Comments: CMFs of crashes involve drivers at age of 65 or older.

[View the Full Study Details]


The information contained in the Crash Modification Factors (CMF) Clearinghouse is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in the CMF Clearinghouse. The information contained in the CMF Clearinghouse does not constitute a standard, specification, or regulation, nor is it a substitute for sound engineering judgment.