Extracted text: A rural collector highway located in mountainous terrain is designed to carry a design volume of 2120 veh/day, Determine the folowing (use any necessary deta from this table and this tatie) (0) a suitable design speed (Enter the minimum design speed in m/h.) mi/h (b) lane and usable shoulder widths (in t) lane width shoulder width (c) maximum desirabie grade (as a percent) Need Help? Raad