A black spot funding program prioritised a project for widening a two-lane rural highway from 5.4 (=2x2.7) m to 6.6 (=2x3.3) m. This project aimed to reduce a particular set of CMF-related crash types such as single-vehicle-run-off-the-road and multiple-vehicles-head-on, opposite direction sideswipe, and the same direction sideswipes. Therefore the CMFs for lane width on the roadway segment given in Table 5.14 (Text 5.1) apply. Compute the expected average total crash frequency after the widening for the following conditions. The expected average crashes before widening = 25 total crashes/year. AADT on the highway segment, before widening = 1150 veh/day AADT on the highway segment, after widening = 1750 veh/day Proportion of total constituted by CMF-related crashes is 0.574
A black spot funding program prioritised a project for widening a two-lane rural highway from 5.4 (=2x2.7) m to 6.6 (=2x3.3) m. This project aimed to reduce a particular set of CMF-related crash types such as single-vehicle-run-off-the-road and multiple-vehicles-head-on, opposite direction sideswipe, and the same direction sideswipes. Therefore the CMFs for lane width on the roadway segment given in Table 5.14 (Text 5.1) apply. Compute the expected average total crash frequency after the widening for the following conditions. The expected average crashes before widening = 25 total crashes/year. AADT on the highway segment, before widening = 1150 veh/day AADT on the highway segment, after widening = 1750 veh/day Proportion of total constituted by CMF-related crashes is 0.574. Answers: Expected average crash frequency after widening = total crashes/year Report your answers to the closest two decimal places without units (i.e., if your answer is 10.258, you should enter 10.26 or if your answer is 23.564, enter 23.56)
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