DDHVDirectional Design Hourly Volume
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Variables Recommended standard values Design speed Urban freeways: 60 mph Rural freeways: 70 mph Number of lanes 5 lanes in each direction 10 ft Right shoulder width 12 ft, where the DDHV for truck traffic exceeds 250 veh/h Left (median) shoulder width At least 4 ft Grade Urban & rural 3%, level terrain, 60 mph Radius Urban 1, 090 ft, 60mph Rural 1, 630 ft, 70 mph TABLE 3: Model results for segments with lighting systems.