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PAST WORK ACTIVITIES Agency Survey The Research Team mailed out over 325 surveys to city, county and state representatives in urban areas with a population of 180,000 and greater and received back 180 of them. A return rate of 55 percent! The returned surveys represent 107,219 of the approximately 300,000 traffic signals located within the United States. Analysis of the data indicates that approximately 27 percent of those 107,219 traffic signals use PPLT phasing on at least one approach. For more information on the Agency Survey read Working Paper 2. Engineering Assessment The Research Team, in concert with the project panel, developed a multitude of questions that were considered key to determining the "best" signal display for the PPLT control. Some of these questions would be answered through more traditional experimental procedures, where as other questions would be answered by applying engineering judgment based upon current practices. Working Paper 1 identifies the methodology and assumptions used to answer these questions. Working Paper is a work-in-progress and is therefore not final. There are several rankings that have been discussed with the project panel and thus will be changed in the next revision of Working Paper 1. Request for Additional Information The Research Team has received an over-whelming response from the traffic engineering community to support this research project through their willingness to participate in data collection; including supplying crash data, video taping intersections, and administering the photo survey (Task 3). A partial listing of those agencies includes: Oregon Department of Transportation [Back] [Continue] with Project Status |
