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Due to network-wide construction work zones, road maintenance planners are considering diverting truck traffic from other...

Due to network-wide construction work zones, road maintenance planners are considering diverting truck traffic from other roads to a four-lane highway which has two lanes in each direction and is on a level terrain. The road maintenance planners would like to utilize the maximum possible flow rate and keep the four-lane highway at LOS C, which is the minimum acceptable LOS in the district. The adjusted free flow speed is 60 miles per hour. The peak hour factor is 0.88, and the directional peak-hour volume is 3000 vehicles per hour. The percentages of large trucks, buses and recreational vehicles in the traffic stream are 8, 2 and 1, respectively. The driver population adjustment factor is estimated to be 0.96. How many trucks can be added to the peak-hour directional volume before LOS C is exceeded? Assume that only trucks are to be added. Also, assume that the PHF remains constant.

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