A rural collector highway located in a mountainous terrain is designed to carry a design volume of 800 veh/day. Determine the following: (a) a suitable design speed, (b) lane and usable shoulder widths, (c) maximum desirable grade.
What will be an ideal response?
(a) From Table 15.1 (for mountainous terrain)
minimum design speed = 30 mi/h
(b) Lane width = 12 ft, usable shoulder width = 10 ft
(c) From Table 15.3
maximum desirable grade = 10%
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