A Class I two-lane highway is on rolling terrain and the free-flow speed was measured at56 mi/h, but this was during a two-way flow rate of 275 veh/h. There are

80% no-passing zones.During the peak hour, the analysis direction flow rate is 324 veh/h, the opposing direction flowrate is 216 veh/h, and the PHF-0.87. There are 5% large trucks and buses and 10% recreational vehicles. Determine the level of service. (30%)