A freeway on a level terrain carries a volume of 4500 veh/hr onfour 11-foot lanes in one direction. the vehicle mix is 75%passenger cars, 10% trucks, 10% buses and 5% recreational vehicles.lateral obstructions are located at a distance of 5 ft on the rightside and 8 ft on the left side of the roadway. given that the design speed is 60 mph and the PHF is 0.70, compute the LOS? listall assumptions.