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Unformatted text preview: Department of Civil Engineering Spring 2009 CEE 4211/5211 Traffic Engineering Dr. Henry Liu 1 Homework #5: Traffic Signal Basics Problem 1 Consider the headway data shown below. Data was taken from the center lane of a threelane intersection approach for a total of ten signal cycles. For the purposes of this analysis, the data may be considered to have been obtained under ideal conditions. (a) Plot headways versus position in platoon for the data show. Sketch an approximate bestfit curve through the data. (b) Using the approximate bestfit curve constructed in (a), determine the saturation headway and the startup lost time for the data. (c) What is the saturation flow rate for this data? Department of Civil Engineering Spring 2009 CEE 4211/5211 Traffic Engineering Dr. Henry Liu 2 Solution Department of Civil Engineering Spring 2009 CEE 4211/5211 Traffic Engineering Dr. Henry Liu 3 Problem 2 For the intersection shown below, (a) find the appropriate number of lanes for each group needed. Assume that all vph shown have been converted to compatible through car equivalent values for the conditions shown. Assume that critical volumes reverse in the other daily peak hour. Now consider a case in which the EW arterial has two lanes in each direction and the NS artery has only one lane in each direction. For this case: (b) what is the absolute minimum cycle length that could be used? (c) what cycle length would be required to provide for a v/c ratio of 0.90 during the worst 15 minutes of the hour if the PHF=0.92? (d) compare these cycle lengths to the optimal delay cycle length suggested by Websters equation. Department of Civil Engineering Spring 2009 CEE 4211/5211 Traffic Engineering Dr. Henry Liu 4 Solution (a) Department of Civil Engineering Spring 2009 CEE 4211/5211 Traffic Engineering Dr. Henry Liu 5 Department of Civil Engineering...
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 Spring '08
 Preston,H
 Traffic Engineering

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