A freeway is being designed for a location in mountainousterrain. The expected free-flow speed is 88.5 km/h. Lane widthswill be 3.6 m and shoulder widths will be 1.8 m. During the peakhour, it is expected there will be a directional peak- hour volumeof 2700 vehicles, 12% large tracks and buses and 6% recreationalvehicles. The PHF and driver population adjustment are expected tobe 0.88 and 0.90, respectively. If a level of service no worse thanD is desired, determine the necessary number of lanes.
