To calculate the minimum value of ruling radius of horizontal curves in plains, the design speed is given by

A. annual average hourly volume B. annual average daily traffic C. thirtieth highest hourly volume D. peak hourly volume of the year

A. reduces right angled and rear end collisions B. increases right angled and rear end collisions C. reduces right angled collisions but may increase rear end collisions D. reduces rear end collisions but may increase right angled collisions

A. 2.5 mm penetration only B. 5.0 mm penetration only C. 7.5 mm penetration only D. both 2.5 mm and 5.0 mm penetrations

A. exceptionally strong B. strong C. satisfactory for road surfacing D. unsuitable for road surfacing