A 6-lane urban freeway (three lanes in each direction) is on rolling terrain with 3.3 m lanes, obstructions 0.7 m from the left edge of the travelled pavement, and has 16 interchanges within 100 km. The traffic stream consists primarily of commuters. A directional weekday peak-hour volume of 2400 vehicles is observed, with 745 vehicles arriving in the most congested 15-min period. If the traffic stream has 13% large trucks and 5% buses and no recreational vehicles, determine the level of service.