A speed enforcement camera demonstration program on Loop 101 Freeway in Scottsdale, Arizona reduced the average speed by about 9 mph, reduced the speed distribution, and reduced the number of speeding drivers by at least a 67.5 percent decrease in the proportion of the number of faster drivers.
Application of automatic speed enforcement on a freeway in Scottsdale, AZ.
This study was conducted to estimate the impact of the SEP on traffic safety, speed, speeding behavior, and daily travel time uncertainty. More specifically, the objectives were to estimate: the impact of the SEP on speeding behavior; the changes in mean speed due to the SEP; the impact of the SEP on traffic safety in the enforcement zone; the total travel time impacts; and the economic impacts of the safety effects.
Five time periods are referenced in the analysis.
- Before (2001 – 2005: various period)
- Warning (01/22/06 – 02/21/06)
- Program (02/22/06 – 10/23/06)
- After (10/24/06 – 12/03/06)
- Reactivation (02/22/07 – 06/29/07)
- The program reduced the average speed by about 9 mph and reduced the speed distribution, factors which are likely to improve safety.
- The speed-enforcement program reduced the number of speeding drivers by at least a 67.5 percent decrease in the proportion of the number of faster drivers, although travel time reliability remained the same.
- The results of a microscopic traffic simulation estimated that the speed-enforcement program resulted in an average of 569 vehicle hours/year and travel time savings of $20,040 (assuming one lane blockage crashes and a $15/hour value) to 37,981 vehicle hours/year and travel time savings of $901,200 (assuming two lane blockage crashes and a $20/hour value).
- The estimates of the total benefits considering the costs of crashes only, range from $16.5 million to $17.1 million per year, depending on the analysis.
Author: Washington, S., Shin, K., and Schalkwyck, I.
Source Date: November, 2007URL: http://www.azdot.gov/TPD/ATRC/publications/project_reports/PDF/AZ684.pdf
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photo enforcement, speed cameras, automated speed enforcement, automated enforcement, photo radar