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A vertical curve has a -3.50% grade followed by a +3.75% grade. For the calculation of S, what standard values of h1 and h2 should be used? A A. 2.0 ft and 0.0 ft B.3.5 ft and 2.0 ft C.4.5 ft and 2.5 ft Ch.16 Risk D. 3.5 ft and 0.0 ft 63. A roundabout has 5 PDO crashes/year. The ADT of vehicles entering the roundabout was 8,653 veh/day. What is the RMEV? B A. 5.78x10-4 B. 1.58 C. 1.58x10-6 D. Insufficient information to answer