Homework 7 - Key - CEE 122 Traffic Engineering Spring 2010...

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CEE 122 Traffic Engineering Spring 2010 Homework #7 Due: __________________ 1. Key: Time - Space Diagram 0 100 200 300 400 500 600 700 05 1 0 Time (seconds) Distance (feet) 1 2
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2. a) Key: Compute spot speed using slope on tangents from nearest intercepts with grid ticks. Vehicle # 1 2 3 4 5 6 T1 50 0 10 20 110 130 T2 90 100 200 200 190 180 D traveled 300 750 950 900 400 300 T traveled 40 100 190 180 80 50 Spot speed 7.5 7.5 5 5 5 6 Vehicles 1-5 pass the observation point between T=50 and T=150. Vehicle 6 is not seen by T=150 at the observation spot and is excluded from average speed calculations. Time mean speed = (7.5+7.5+5+5+5)/5=30/5=6 feet/second Space Mean Speed = s ft / 77 . 5 5 1 5 1 5 1 5 . 7 1 5 . 7 1 5 1 1 = + + + + b) Key: Between vehicles #2 and #3, 300 feet c) Key: 60 seconds between vehicles #2 and #3 between D=750 and D=950. d) Key: Travel time = 110 seconds Running time = 110 – 10 = 100 seconds Travel speed = 500/110 = 4.55 ft/s Running speed = 500/100 = 5 ft/s e) Key: When T=50, # of vehicle counted = 5 s = 500/5 = 100 ft/vehicle k = 1/s = 0.01 vehicle/ft = 52.8 vehicle/mile f) Key: Vehicles #5 and #6.
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3. Key:
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This note was uploaded on 09/08/2010 for the course CE 224 at San Jose State University .

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Homework 7 - Key - CEE 122 Traffic Engineering Spring 2010...

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