LTC 629-2018 Evaluation of Photo Red Light Enforcement Program RT7so .2018 -302g .
MIAM1B EACH'
OFFICE OF THE CITY MANAGER
•NO. LTC # LETTER TO COMMISSION
629-2018
To: Mayor Dan Gelber and Members f the Cit Commission
From: Jimmy L. Morales, City Manager
Date: December 7, 2018
Subject: Evaluation of Photo Red.Light Enforcement Program
The purpose 'of this Letter to Commission is to transmit the final report for the Evaluation of
Photo Red Light (PRL) Enforcement Program in the City of Miami Beach submitted by Florida
International University's Lehman Center for Transportation Research on December 7, 2018.
At the March 2018 Neighborhoods/Community Affairs Committee (NCAC) meeting, Committee
members suggested the evaluation of the City's photo red light camera program data. Florida
International University's Lehman Center for Transportation Research submitted a. proposal
specifying the assessment approach for the nine (9) intersections-with photo red light cameras
and the intersectionsto be usedas thecontrol group. The cost for the assessment was not to
exceed $13,500 with funds from the police departments PRLprogramto fund the study.
The proposal was approved via Resolution No..2018-30284 at the April 11, 2018 Commission
meeting. Dr. Priyanka Alluri, Assistant Professor FIU Lehman Center for Transportation
Research andprimary contact for the study, worked. with City staff in the Transportation
Department, Police Department, and Organizational Development Department, to collect all
required data. Dr. Alluri.provided the completed-evaluation to administration on December 7,
2018.
The main objectives of the study were to evaluate the safety and.effectiveness of the PRL
Enforcement Program in Miami Beach. The simple before-and-after analysis and the full Bayes
(FB) before-and-after evaluation approach were used to quantify the safety effectiveness of the
RLCs. The analysis was based on target crashtype which includes angle/left-turn/right-turn,
rear-end, and sideswipe crashes, and target crash severity which includes property damage
(PDO) and fatal/injury crashes.
A total of of ten RLCs are operational at nine signalized intersections.in Miami Beach: Due to
the long period of construction activity, the intersection where Alton Road meets 17th Streetwas
not included in the study: The simple before-and-after crash data analysis was conducted for
the remaining:eight signalized intersections. The advanced full Bayes before-and-after analysis
was conducted only for the five four-legged signalized intersections. Only three treatment
intersections are three-legged; the sample size is too small to yield reliable results from the FB
statistical analysis:
The below are the findings from the simple before-and-after crash data analysis:
• Four-legged.Intersections with RLCs
o Reduction in target crashes after the installation of RLCs
o Target crash types angle/left-turn/right-turn and sideswipe crashes usually
decreased while rear-end crashes usually increased
o Reduction in PDO target crashes
• Approaches with RLCs
o At three of the five intersections, target crashes reduced after the installation of
RLCs
o At two of the five intersections, total crashes reduced after the installation of
RLCs.
o At three of the five intersections, rear-end crashes increased after the installation
of.RLCs
• Three-legged Intersections with RLCs
o Intersections with RLCs experienced a reduction in target crashes after the
installation of RLCs
o Atall three intersections, rear-end and sideswipe crashes reduced after the
installation of RLCs
o Angle crashes reduced at two of the three intersections
o Reduction in PDO target crashes .
o Approach with RLCs no target crashes after the installation of RLCs
• Safety Performance of Intersections with No RLCs
o Average number of target crashes at the non-treatment intersections (i.e.,
signalized intersections, with no RLCs) that are in the vicinity of treatment
intersections reduced from 2011-2013 with fewer angle/left-turn and sideswipe
crashes
o Average number of target crashes at five signalized intersections that are far
away from the intersections with RLCs was higher during 20.11-2013 compared
to 2008-2009.with an increase in angle/left-turn and sideswipe crashes
The below are the findings from the full Bayes before-and-after analysis:
• Crashes at the treatment intersections on an increasing trend similar to city, state, and
national level crashes on an increasing trend
• Significant sudden drop in all types of target crashes immediately after the installation of
RLCs
• Compared to the before-period, the after-period experienced fewer angle/left-turn/right-
turn crashes, fewer sideswipe crashes, and more rear-end crashes
• Sideswipe and angle/left-turn/right-turn crashes droppedimmediately after the
installation of RLCs and then continued to increase, but are still lower than the before-
period
• Rear-end crashes dropped immediately after the installation of the RLCs and then
continue to increase .
A discussion of the evaluation is on the December 14, 2018 Neighborhoods/Community Affairs
Committee agenda.
Please contact me should you have any questions or concerns.
Attachme t .
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