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2. A simple circular curve on a rural roadway is designed with a radius of 1500 ft and a design speed of 55 mph. No spiral transition curve is to be used. The emax standard is 10%. The road has one lane per direction with 12-ft lanes and a 1% normal crown. (1.5 pts) a. Determine the design superelevation value (ed) and the corresponding lengths of superelevaion runoff (Lr) and tangent runout (Lt) (1.5 pts) b. Do a free-hand elevation profile drawing of how the transition from normal crown to full superelevation is to take place (rotation about the centeine. Assuming the PC is at station 20+00, on your drawing indicate the station numbers associated with the beginning and end of Lt and Lr for values specified in part (a). (1 pt) c. What would the values of Lr and Lt in part (a) be if the roadway were instead a four-lane road with lanes, ie. two 11-ft lanes per direction?
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127 R 07S on anton pT prn 3612

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