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Peak hour factor and average headway, spacing, clearance, and gap

by | Nov 30, 2023 | questions

The following data were collected during a study of a four-lane freeway. The data shownwere collected in the eastbound travel lanes.Time Lane 1 (veh) Lane 2 (veh)4:00-4:05 P.M. 190 2014:05-4:10 145 2084:10-4:15 200 2174:15-4:20 168 2324:20-4:25 220 2194:25-4:30 233 2204:30-4:35 245 2054:35-4:40 145 2014:40-4:45 180 1954:45-4:50 214 2104:50-4:55 180 1904:55-5:00 169 195
(e) what is the theoretical minimum value of PHF? Show how you derived it, and(f) what is the theoretical maximum value of PHF? Show how you derived it.
2.Assuming a linear speed-density relationship, the mean free speed is observed to be 50 mphnear zero density, and the corresponding jam density is 120 vpm.
d) Assume the percentage of vehicles using this highway are distributed as follows:Vehicle Type Length PercentSmall cars 18.0 feet 72%Medium trucks 27.0 feet 13%Large trucks 71.5 feet 12%Recreational vehicles 52.0 feet 3%————————————————————————-Compute the average headway, spacing, clearance, and gap when the flow ismaximum.

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