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Red Light Running Cameras (ongoing
Safety study)
Fatemeh Baratian Ghorghi
PhD Student at:
Auburn University, Department of Civil Engineering
INTRODUCTION
Evaluate the effectiveness of RLC systems in Opelika
1. Operational Impact
2. Safety Impact
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
DATA COLLECTION
• CARE
1. Crashes due to RLR violation
2. Rear-end crashes (not every RE crash!!!! Just related to the RLC)
• Not clearly defined in crash reports : 2 filters
DATA COLLECTION
Before: April 2010 –April 2013 After: April 2013 –April 2014 (Only April 2013- July
2014 is available now)
DATA ANALYSIS• RLR Crashes
• Before: April 2010 –April2013
Intersection (BEFORE) April 2010 –April2013
SeverityNumber Injured
Number Killed
Number crash
PDOPossible Injury
Non-Incapacitatin
g Injury
Incapacitating Injury
Fatal
Monitored approaches
Pepperell Parkway& Gateway Drive
5.0 1.0 1.0 1.0 0.0 8.0 0.0 8.0
Interstate Dr & Gateway Drive 4.0 0.0 0.0 1.0 0.0 1.0 0.0 5.0
Fredrick Rd & Gateway Drive 2.0 1.0 1.0 0.0 0.0 4.0 0.0 4.0
Fox Run Pkwy&W Point Ave 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Total 11.0 2.0 2.0 2.0 0.0 13.0 0.0 17.0
DATA ANALYSIS• RLR Crashes
• After: April 2013- April 2014
Intersection (BEFORE) April 2010 –April2013
SeverityNumber Injured
Number Killed
Number crash
PDOPossible Injury
Non-Incapacitatin
g Injury
Incapacitating Injury
Fatal
Monitored approaches
Pepperell Parkway& Gateway Drive
1.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0
Interstate Dr & Gateway Drive 1.0 2.0 1.0 0.0 0.0 5.0 0.0 4.0
Fredrick Rd & Gateway Drive 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Fox Run Pkwy&W Point Ave 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Total 2.0 2.0 1.0 0.0 0.0 5.0 0.0 5.0
DATA ANALYSIS• RE Crashes
• Before: April 2010 –April2013
Intersection
SeverityNumber Injured
Number Killed
Number crash
PDOPossible Injury
Non-Incapacitating Injury
Incapacitating Injury
Fatal
Monitored approaches
Pepperell Parkway& Gateway Drive
1.0 0.0 1.0 0.0 0.0 1.0 0.0 2.0
Interstate Dr & Gateway Drive 1.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0
Fredrick Rd & Gateway Drive 2.0 0.0 0.0 0.0 0.0 0.0 0.0 2.0
Fox Run Pkwy&W Point Ave 1.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0
Total 5.0 0.0 1.0 0.0 0.0 1.0 0.0 6.0
DATA ANALYSIS• RE Crashes
• After: April 2013- April 2014
Intersection
SeverityNumber Injured
Number Killed
Number crash
PDOPossible Injury
Non-Incapacitatin
g Injury
Incapacitating Injury
Fatal
Monitored approaches
Pepperell Parkway& Gateway Drive
0.0 0.0 1.0 0.0 0.0 1.0 0.0 1.0
Interstate Dr & Gateway Drive 1.0 0.0 0.0 0.0 0.0 0.0 0.0 1.0
Fredrick Rd & Gateway Drive 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Fox Run Pkwy&W Point Ave 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Total 1.0 0.0 1.0 0.0 0.0 1.0 0.0 2.0
Timeline
• Starting from January1st, 2014
• Literature Review (April 1st, 2014)
• Identify Required Information (May 1st, 2014)
• Field Observation (June 15th , 2014)
• Data Collection (August 15th , 2015)
• Data Analysis (Oct 15th , 2015)
• Interpretation of Results & Recommendation (December 1st , 2015)
• Final Report (December 31st , 2015)
ALDOT Proposal
• Widespread use of cameras necessitates further study.
• Safety Evaluation of about 40 intersections in Alabama1. Change in number of crashes?
2. Change in number of violations? Access to the number of citations