Journal Article Title: Forensic Engineering Analysis at a Traffic Signal: Who Had the Green Light?
Article Author(s): Hintersteiner, Robert T., P.E.
Volume: 21
Volume #: 2
Month: December
Year: 2004

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Abstract:

Forensic Engineering Evaluation and Analysis is an essential tool in resolving the facts in a traffic accident. A Forensic/Traffic Engineer is typically retained months or years after the event. Often, the parties involved in an accident at a traffic signal make conflicting statements as to which party had the Green Light. This paper presents a methodology for the analysis and evaluation of an intersection regarding the operations of the Traffic Signal by a Forensic/Traffic Engineer so that an opinion can be rendered to an attorney, and form the basis for the Forensic/Traffic Engineer’s testimony should the matter go to trial. The following Case Studies illustrated the above parameters and how they are best presented to an attorney, judge, and jury. Case #1 involved determining who had the right of way when all the signal lights were out. Case #2 involved determining who had the right of way when one vehicle made a left turn in front of an opposing vehicle. Case #3 involved determining who had the right of way at a Pedestrian crossing without Pedestrian Signals. Case #4 involved determining who had the right of way when everyone had a Green light.