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A six-lane divided multilane highway (three lanes in each direction) has a measured free-flow speed of...

A six-lane divided multilane highway (three lanes in each direction) has a measured free-flow speed of 50 mi/h. It is on mountainous terrain with a traffic stream consisting of 7% large trucks and buses and 3% recreational vehicles. The driver population adjustment in 0.92. One direction of the highway currently operates at maximum LOS C conditions and it is known that the highway has PHF=0.90.

1. Determine the hourly volume for these conditions.

2. How many vehicles can be added to this highway before the capacity is reached, assuming the proportion of vehicle remains the same but the peak - hour factor increases to 0.95?

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