Question

(2 points) A horizontal curve on a two-lane highway (12-ft lanes) is designed for 55 mi/h with a 6% superelevation. The central angle of the curve is 50 degrees and the PI is at station 212+67. What is the station of the PT? Determine the length of superelevation runoff and tangent runout for the associated curve transition section (assume a normal, 2% crown). Assume perception-reaction time of 2.5 sec and the deceleration rate for braking (a) is 11.2 ft/sec2

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emax= 6% 2 6.68 V 6.68 (55) O3 1O63 5 3 ft 2 495.93 Length 。.0174 53 3 (106353〉(50) =- 216+ 99.1+5 4 「ANS ! (b Length super elavaton umoff (Assume tha outs trans : tim be o.5%, DE 5% r12 SR → SR SR - 4ft ANS <

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