A new suburban freeway is being designed. Estimated AADT is
40,000 veh/day, 60% of the peak...
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Civil Engineering
A new suburban freeway is being designed. Estimated AADT is40,000 veh/day, 60% of the peak flow traffic travels in the peakdirection, the PHF is 0.85, and the terrain is rolling. There willbe 3 ramps per mile, and traffic is expected to include 18% heavyvehicles (50% SUTs and 50% TTs). Lanes will be 12 feet wide with alateral clearance of 6 feet. One segment of the road of the roadhas a 0.75-mile-long section with a 3.5% grade.
a) How many lanes are needed to provide level of service Cduring the peak hour using the 30th highest hourly volume (seeFigure 6.8 in text and in lecture notes on design hourly volumes)on the road and how many lanes are required on the segment with the3.5% grade?
b) Does the number of lanes change if you design for LOSD?
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AADT 40000 vehdaydirectionality factor 06assume a k factor which converts daily flow into peak hourlyflow 012so Design Hourly Volume V 40000 6 12 2800 vehhrIts rolling terrain with 35 upgrade over 34mile18 heavy vehices of which 50 are trucks buses and 50 areRVsso we can say PT Percentage of Trucks Buses 9 009PR Percentage of RVs 9 009So we can take ET 25 and ER 20SoSo wecan calculate Heavy vehicle factor fHV and it is calculated usingthe formulaSo fHV 1109 15 091 11225
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