Evaluation of red light camera's safety improvement program
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Evaluation of Red Light Cameras Safety
Improvement Program in Alabama
Fatemeh Baratian Ghorghi
PhD Student at:
Auburn University, Department of Civil Engineering
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INTRODUCTION
• Background
• Objectives
• Literature Review
• Data Collection
• Data Analysis
• Suggestion based on the results
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BACKGROUND
• RLR crash, the most common/most severe type of crash
• More than 165,000 injuries in 2008
• RLC supplement Law enforcement efforts
• National Survey
• Opponents: a tool to gather revenue
• No study evaluates the effectiveness of RLCs in AL
• Safety benefits
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OBJECTIVES
Evaluate the effectiveness of RLC systems in Opelika
1. Safety Impact
2. Operational Impact
Quantify the economic performance
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LITERATURE REVIEW
1. Evaluation of camera’s safety effects (20)
2. RLCs Site Selection (10)
3. RLR Behaviors (6)
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1- Past findings of safety effects
• Reduced violation rate by about 40% during the first year
• Reduced right-angle crashes (injury and fatal) 19% - 32%
• Increased rear-end crashes (PDO) up to 40%
• The costs were offset by benefits
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2- Studies of RLCs Site Selection
Effective factors:•AADT, high ratio of RA to RE crashes, shorter inter-green periods and cycle length
•Collision severity, commercial vehicles, net economic cost, feasibility of site installation
•High number of collisions, dispersion of intersections
•Larger number of lanes of the primary-street, fully actuated traffic signals
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3- Studies of RLR Behaviors
• Increase in average traffic speed, and heavy vehicles, reduces RLR in low AADT
• Violators under 30 were not speeding
• 94% within 2 s, between 2 PM and 3 PM
• Shorter green-to-cycle time, increase in time to cross, and following another vehicle suggests a lower likelihood
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Two studies in Alabama
1. A pilot study of feasibility for using RLC (2003)
2. A general guideline developed to assist site selection and implementation of RLC program in Alabama (2014)
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RLC in Alabama
8 communities in Alabama:•Birmingham•Center Point•Foley•Midfield•Montgomery•Opelika•Phoenix City•Tuscaloosa
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RLC in Opelika, AL• April 1, 2013
• The overall safety effect is not clear.
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DATA COLLECTIONThe exact location of RLCsTraffic volume for each approach per hourIntersection geometric featuresSigning and publicitySpeed limit
? Program start and end date
? Citation
? Signal timing and control type
? Crash and violation frequency (Min 2 weeks for #/h and 3 years before and after for #/year)
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Field Data Collection
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CARE Software• Right-angle plus rear-end crashes
• Not clearly defined in crash reports
• 2,210 out of 21,020 in Alabama
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DATA ANALYSIS
1. Safety impact: EB method, Crash prediction models, Crash modification factors
2. Economic performance: benefit-and-cost analysis, Crash reduction benefit, Cost of the camera
3. Operational impact: Field data collection, Driver’s behavior study
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Running Behavior
(a) (b)
(c) (d)
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Running Behavior
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Suggestions
1. Site Selection: Where to install?
2. How much fine?
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Timeline
• Starting from January1st, 2014
• Literature Review (April 1st, 2014)
• Identify Required Information (May 1st, 2014)
• Field Observation (June 15th , 2014)
• Data Collection (September 15th , 2014)
• Data Analysis (March 1st , 2015)
• Interpretation of Results & Recommendation (August 1st , 2015)
• Final Report (December 31st , 2015)
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Thank You!