United States Department of Transportation
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Abstract:This research effort was conducted to determine the effectiveness of low-cost countermeasures in reducing the number of accidents at narrow bridges. The principal tasks consisted of 1) developing an accident based effectiveness evaluation plan and 2) conducting an operational based effectiveness evaluation. This report describes the activities and results of the operational based effectiveness evaluation. The operational based evaluation was performed by conducting before and after analyses of vehicle speed and lateral placement at 18 narrow bridge approach sites. The low-cost countermeasures that were evaluated consisted of combinations of advance warning signs, pavement markings, raised pavement markers, roadside delineators, type 3 object markers and adhesive delineators. The operational data were obtained by using the Federal Highway Administration's Traffic Evaluator System. With the exception of one analysis category, the operational based effectiveness evaluation did not reveal significant difference, at the 10 percent level, between the before and after time period. The one exception was that the low-cost countermeasures significantly reduced speed variation when all vehicle types and time periods were analyzed together. For this analysis category, therefore, the low-cost countermeasures resulted in more uniform driving behavior.
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