(civl261)[2009](s)quiz6b~PPSpider^_10069[1]

(civl261)[2009](s)quiz6b~PPSpider^_10069[1] - CIVL 261...

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CIVL 261 – Traffic and Transportation Engineering Tutorial Quiz 6B March 25, 2009 Name : Student ID : Geometric Design of Highways – Crest Vertical Curve For a design speed of 60 mph, f = 0.29, calculate the minimum length of a crest vertical curve with G 1 =+3 % and G 2 = -1 % that meets the 1984 AASHTO criteria for minimum SSD and desirable SSD. Solution: Design speed = 60 mph. From Table 3.1, the speed condition is distributed between 52 mph and 60 mph. Minimum SSD For minimum SSD, we use average running speed at 52 mph. So () ( ) () ft vt G f g v SSD r 540 5 . 2 47 . 1 52 03 . 0 29 . 0 2 . 32 2 47 . 1 52 2 2 2 = × × + × × × = + ± = Assuming SSD > L, then (rejected) 540 748 4 1329 540 2 1329 2 ft ft A SSD L m > =
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This note was uploaded on 02/01/2012 for the course CIVL 262 taught by Professor Lee during the Spring '09 term at HKUST.

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