Question

CENG 3311- Intro Transportation Engineering Fall Semester, 2018 A state transportation agency has established crash reduction factors shown in the table. An intersection has been identified as having an abnormally high rear-end crash rate (15, 13, 16 crashes in the last three years), attributed to poor visibility of the traffic signal and the timing of the yellow and all-red intervals. The ADT of the intersection for the last three years is 18,000 and the ADT for the intersection after implementation is 19,500. Based on the resource "Crash Modification Factor Clearinghouse", the expected reduction in crashes in the following countermeasures are expected if implemented. [20 points] 7. Reduction Factor Countermeasure Retiming traffic signal 0.12 Add additional signal 0.31 heads in upgrade to 12-inch lenses Estimate the crashes prevented per year with the proposed improvements.

Answer 1