Homework 10 - key

# Homework 10 - key - CEE 122 Traffic Engineering Spring 2010...

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Traffic Engineering Spring 2010 Homework #10 Due: __________________ 1. Key: hr veh D K AADT DHV / 3713 55 . 0 09 . 0 75000 = × × = = PCE E T 5 . 2 = , from exhibit 23-9 () () 87 . 0 15 . 1 1 ) 1 5 . 2 ( 1 . 0 1 1 1 1 1 1 = = × + = + + = R R T T HV E P E P f Try 4 lanes, 2 lanes in each direction: N=2 0 . 1 = P f pchpl f f N PHF V v P HV P 2371 566 . 1 3713 0 . 1 87 . 0 2 90 . 0 3713 = = × × × = = LOS=E, from exhibits 23-2 or 23-3 No good. Try 6 lanes, 3 lanes in each direction: N=3 0 . 1 = P f pchpl f f N PHF V v P HV P 1581 349 . 2 3713 0 . 1 87 . 0 3 90 . 0 3713 = = × × × = = LOS=C, from exhibits 23-2 or 23-3 OK. mph S 5 . 69 = , from exhibit 23-3 vpmpl S v D P 75 . 22 5 . 69 1581 = ÷ = = , OK 2. Key: 1) 12ft lane, 2) 6ft lateral clearance to the right, 3) 2ft lateral clearance to the left, 4) 5 lanes or more in one direction (urban freeway only), 5) all commuters, 6) all passenger cars, 7) level terrain, 8) 0.5/mile interchange density. 3.

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Homework 10 - key - CEE 122 Traffic Engineering Spring 2010...

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