A six-lane freeway (three lanes in each direction) is located on rolling terrain. The lanes are all 12-ft in width and with an obstruction 4-ft from the right side of the travel lanes. Ramps are spaced such that there is 1 ramp every 2 miles. The free-flow speed was measured to be 75 mph. A weekday directional peak-hour volume of 3,200 vehicles is observed, with 870 arriving in the most congested 15-min period. Approximately 6% of the vehicles are heavy vehicles (trucks, buses and RVs). 1) What free-flow speed curve should be used? Give your answer in mph to the nearest tenth of a mph.
2) What is the capacity of this basic freeway segment? Give to the nearest whole value of pcphpl.
3) What is the PHF, to three decimal places?
4) What is the heavy-vehicle adjustment factor, to three decimal places?
5) What is the demand volume to the nearest whole value of pcphpl?
6) Is this segment operating above capacity?
7) What is the breakpoint value for the free-flow speed curve that you identified in part 1) of this question? Give to the nearest tenth of a mph.
8) At what speed is this segment operating? Give to the nearest tenth of a mph.
9) At what density is this segment operating? Give to the nearest tenth of a pcpmpl.
10) At what level of service is this segment operating?