Homework 5 - key

Homework 5 - key - CEE 122 Traffic Engineering Spring 2010...

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CEE 122 Traffic Engineering Spring 2010 Homework #5 Due: __________________ 1. Key: 98 . 28 2 . 32 45 . 0 2 30 2 2 1 2 1 2 2 2 1 u u g f u u d = = = = s ft u u / 5 . 29 4 . 869 1 2 1 = = , speed at the boundary of asphalt surface and gravel surface 08 . 45 25 . 870 2 . 32 70 . 0 2 5 . 29 130 2 2 1 2 2 1 2 2 2 1 = = = = u u g f u u d hr MI s ft u u / 8 . 55 / 82 65 . 67330 25 . 870 4 . 5860 1 2 1 = = = + = , speed at the beginning of the skid 2. Key: 2 . 32 2 2 8 2 2 2 0 2 2 2 1 2 0 2 2 2 1 = = = = f u g f u u u w u u d 248 . 0 2 . 32 8 = = f 3. Key: The sequence of steps is denoted by the number in brackets []. Curve Beginning Speed & Distance Reading Distance Traveled Ending Speed & Distance Reading 4% 50 [email protected] ft /A [1] 1000 +2700= 3700 ft [2] 44 mph @ B/3700 ft [3] 4% 47 [email protected] ft/C [6] 4100-900=3200 ft [5] 50–10= 40 [email protected] ft /D [4] 1% 44 mph @3600 ft/B [8] 5200–3600= 1600 ft [9] 47 [email protected] ft/C [7] Minimum length of the 1% grade = 1600 feet
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Grade Profile 0 20 40 60 80 100 120 140 160 0 2000 10000 12000 Distance Elevation 4% 1% 4% 1% A D C B E 0% - 50mph 44mph 40mph 47mph
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4. Key: Some information given is not used in solving this problem.
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This note was uploaded on 09/08/2010 for the course CE 224 at San Jose State.

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Homework 5 - key - CEE 122 Traffic Engineering Spring 2010...

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