单选题 15th percentile speed means that (　　) of the vehicles are traveling faster than it.

单选题 Which of following is not the kinematic characteristics of motor vehicles? (　　)

单选题 Which of the following is the true relation between volume Q, speed v and density K (　　)?

单选题 For a single channel toll station, the flow rate of vehicle arrival is 900 veh/h, the service rate is 3 sec/veh. Assuming the first vehicle to arrive is first to depart, the state of this queuing system is ( ), and its traffic intensity is (　　).

单选题 The directional distribution factor of traffic volume on road segment is in the range of (　　)?

单选题 On a highway, the free flow speed is 80 km/h, and the jam density is 100 veh/km. Assuming a linear model for speed-density relationship, the maximum flow rate is(　　) veh/h and corresponding speed is km/h.

单选题 (　　) is that part of the delay caused by the impedance of other traffic.

单选题 There are (　　) LOSs in China, (　　) LOSs in America.