An 8-lane basic freeway segment (bfs) is on rolling terrain. it has 12 ft lanes with a 4 ft right shoulder. there are 7 ramps within the 6-mile segment of interest. the directional peak traffic volume is 5200 veh/hr with 6% trucks and 2% buses. there is no recreational vehicle. the traffic stream consists of regular users and the peak hour factor (phf) is 0.90. calculate the free-flow speed (ffs), analysis flow rate vp, and determine the level of service (los).