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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information|
Publication Number: FHWA-HRT-05-048
Date: April 2005
Safety Evaluation of Red-Light Cameras
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As shown in figure 1, the work was conducted in two phases. Phase I involved the development of a detailed experimental design. This was reviewed and subsequently approved by FHWA with minor modifications. In Phase II, the design was then implemented. This report describes both of these phases in detail.
As shown in figure 1, the Phase I effort involved multiple steps to establish goals for the evaluation, collection of background information that would help shape the evaluation plan, choice of the jurisdictions to be involved in the evaluation, and definition of the data collection and statistical techniques to be used. Following are the tasks in the Phase I experimental design:
As the task list shows, there were actually two experimental plans or methodologies developed in this Phase I effort. The first is a national design in which data from multiple jurisdictions across the United States were used to both define the crash-related effectiveness of RLC programs and to explore factors that could make such programs more beneficial in terms of crash reduction (e.g., signalization variables such as clearance intervals and cycle lengths, and public information programs and signage related to RLC programs). The primary outcome variable of interest here is RLC-related change in the frequencies of different types of crashes. The second experimental plan involved the development of a database and methodology to examine, in economic terms, costs and benefits of RLCs, thus simultaneously analyzing changes in crash severity and crash frequency. The following sections describe the development of this economic analysis methodology initiated in Phase I and revised and completed in Phase II; The full development process is described in the Phase II section.
After FHWA agreed with the Phase I evaluation design, funding was provided for the implementation of the evaluation efforts. The project team then performed the following steps:
The narrative following the literature review will describe each of the steps in both Phase I and Phase II in more detail.
Topics: research, safety, intersection safety, Stop Red Light Running Program
Keywords: research, safety, red light camera, Empirical Bayes, crash evaluation, economic analysis, signalized intersection
TRT Terms: Electronic traffic controls--Evaluation, Photography in traffic engineering, Cameras, Roads--Interchanges and intersections--Safety measures, Traffic safety--United States, Red light running, Cameras, Before and after studies, Economic analysis, Accident analysis, Accident characteristics