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Assignment Transportation Engineering Q.1 (a) A descending gradient of 1 in 22.5 meets an ascending gradient of 1 in 25. Design length of valley curve to be comfortable as well as to leave adequate head light sight distance. Velocity V= 60kmph, rate of change centrifugal acceleration C=0.55 m/s^3, time of reaction tr = 2.5 S, coefficient of longitudinal friction =0.38, height of headlight above the ground = 0.8m, beam angle is 1°. (b) In above question if 1 in 22.5 is ascending gradient meets a 1 in 25 descending gradient design the length of the summit curve.
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