Evaluation of the City of Scottsdale Loop 101 Photo Enforcement Demonstration Program
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Evaluation of the City of Scottsdale Loop 101
Photo Enforcement Demonstration Program
Final Report AZ-684
Prepared by:
Simon Washington, Ph.D.Kangwon ShinIda van SchalkwykArizona State UniversityDepartment of Civil & Environmental EngineeringTempe, AZ
November 2007
Prepared for:
Arizona Department of Transportation206 South 17th AvenuePhoenix, Arizona 85007
in cooperation withU.S. Department of TransportationFederal Highway Administration
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Technical Report Documentation Page
1. Report No.
AZ-07-6842. Government Accession No. 3. Recipients Catalog No.
5. Report Date
November 20074. Title and Subtitle
Evaluation of the City of Scottsdale Loop 101 Photo EnforcementDemonstration Program
6. Performing Organization Code
7. Authors
Dr. Simon Washington, Kangwon Shin, and Ida van Schalkwyk8. Performing Organization Report No.
10. Work Unit No.9. Performing Organization Name and Address
Arizona State UniversityDepartment of Civil & Environmental EngineeringTempe, AZ 85287-5306
11. Contract or Grant No. T0749A0022
13.Type of Report & Period Covered
Final Report
12. Sponsoring Agency Name and Address
Arizona Department Of Transportation206 S. 17th Avenue, Phoenix, Arizona 85007
14. Sponsoring Agency Code
15. Supplementary Notes
Prepared in cooperation with the U.S. Department of Transportation, Federal Highway Administration
16. Abstract
Speeding is recognized as one of the most important factors causing traffic crashes. In 2005, 30% of all fatalcrashes were speeding-related (National Highway Traffic Safety Administration 2005). According to NHTSA,the cost of speed-related crashes is estimated to be $40.4 billion per year (National Highway Traffic SafetyAdministration 2005). Intelligent Transportation Systems (ITS) now exist to reduce speeding-related crashes byenforcing speed limits with camera-based technologies. These enforcement technologies are generically calledspeed cameras and have been effective on municipal streets and arterials in Arizona.
The City of Scottsdale began automated enforcement efforts in December of 1996. On October 25, 2005,the Scottsdale City Council approved the nine-monthspeed enforcement camera demonstration programon a7.8-mile stretch of the SR 101 segment within Scottsdale. The speed enforcement program (SEP) began onJanuary 22, 2006 and ended on October 23, 2006. The demonstration program on the SR 101 freeway segmentin Scottsdale is the first use of the fixed-site photo enforcement equipment on a freeway in Arizona and isbelieved to be the first in the nation.
This study was conducted to estimate the impact of the SEP on traffic safety, speed, speeding behavior,and daily travel time uncertainty. More specifically, the objectives were to estimate: the impact of the SEP onspeeding behavior; the changes in mean speed due to the SEP; the impact of the SEP on traffic safety in theenforcement zone; the total travel time impacts; and the economic impacts of the safety effects.
17. Key Words
Photo enforcement, speeding, safety, red light running,Empirical Bayes, before-after study, travel timesavings, motor vehicle crashes
18. Distribution Statement
Document is available to the U.S.public through the NationalTechnical Information Service,Springfield, Virginia 22161
23. Registrants Seal
19. Security Classification
Unclassified
20. Security Classification
Unclassified
21. No. of Pages
154
22. Price
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9#71*0:G;(20*470
64#?,60%0)%#&+'*0@10+),50*)4-0*
461*#+7%
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(#$ '2:3$+ &* :&(&+/)() $V%$$4/'= ]`:,#6
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,$+/&4 W)$$ "13-$ UUX 1+$ )2::1+/8$4> 1'4 (#$ ),$$4 41(1 42+/'= (#$-"./"#),$+/&4 1+$
4$)%+/3$4 /' (#$ 1'1-5)/) )23)$%(/&'6
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9#71*0 :C; 35006W'?&I )1*20 3&1*)0; _SF >===`
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d]
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