Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 5, Problem 6P
To determine
The expected number of crashes (per year) after the improvement is constructed.
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- The state transportation agency has established crash reduction factors shown in the table. An intersection has been identified as having an abnormally high left turn crash rate (17, 20, and 18 crashes in the last three years), attributed to excessive speeds and the absence of an exclusive left-turn phase. The ADT of the intersection for the last three years is 8,400, and the ADT for after implementation is 9,500. Determine (a) the appropriate countermeasures and (b) the expected reduction in crashes if the countermeasures are implemented. . Countermeasure Crash Reduction Factor Retime Signals 0.10 Provide left-turn signal phase 0.30 Reduce speed limit on approaches 0.35 Provide turning guide lines 0.05 Prohibit left turns 0.75arrow_forwardMatch the following facility with the LOS criteria used to evaluate the performance on the facility Freeway basic segment A. Density Multilane highway automobiles B. Bike LOS score C. Percent time spent following Freeway weaving segment D. Number of crashes Signalized Intersection Bicycles on multilane highways E. Average speed F. Average delay per vehiclearrow_forwardNeed type answer a. A section of road has 55 accidents recorded in three years. For the same period, the estimated vehicle travel on the section was 23 mvk. Considering only those sections having the same characteristics as the section under study, the mean rate is 80 accidents per 100 mvk. Is the section hazardous with 90 percent level of confidence? b. Based on the graph of the accidents time per day on ‘explain’, what time makes up the most number of accidents? Discuss and explain why the frequency of accident is high.arrow_forward
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