A Six-Lane Divided Multilane Highway

1. A four-lane undivided multilane highway (two lanes in each direction) has 11-ft lanes, 4-ft shoulders, and 10 access points per mile. It is determined that the roadway currently operates at capacity with PHF = 0.80. If the highway is on level terrain with 8% heavy vehicles and the speed limit is 55 mi/h, what is the directional hourly volume?

2. A new four-lane divided multilane highway (two lanes in each direction) is being planned with 12-ft lanes, 6-ft shoulders on both sides, and a 50- mi/h speed limit. One 3% downgrade is 4.5 mi long, and there will be four access points per mile. The peak-hour directional volume along this grade is estimated to consist of 1800 passenger cars, 140 SUTs, and 60 TTs. If the peak-hour factor is estimated to be 0.85, what LOS will this segment of highway operate under?

3. A six-lane divided multilane highway (three lanes in each direction) has a measured FFS of 50 mi/h. It is on rolling terrain with a traffic stream consisting of 6% heavy vehicles. One direction of the highway currently operates at maximum LOS C conditions, and it is known that the highway has PHF = 0.90. How many vehicles can be added to this highway before capacity is reached, assuming the proportion of vehicle types remains the same but the peak-hour factor increases to 0.95?

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