Traffic Stream

1. A six-lane freeway (three lanes in each direction) in rolling terrain has 10-ft lanes and obstructions 4 ft from the right edge of the traveled pavement. There are five ramps within three miles upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. A directional peak-hour volume of 2000 vehicles is observed, with 600 vehicles arriving in the highest 15-min flow rate period. The traffic stream contains 18% heavy vehicles. What is the density of the traffic stream?

a) 8.49 pc/mi/ln b) 17.15 pc/mi/ln c) 14.28 pc/mi/ln d) 14.88 pc/mi/ln

2. A six-lane freeway (three lanes in each direction) in level terrain has 10-ft lanes and obstructions 5 ft from the right edge. There are zero ramps within three miles upstream of the segment midpoint and one ramp within three miles downstream of the segment midpoint. The traffic stream has a peak-hour factor of 0.84, peak-hour volume of 2500 vehicles, and 4% heavy vehicles. What is the LOS?

a) LOS A b) LOS B c) LOS C d) LOS D

3. A four-lane divided multilane highway (two lanes in each direction) in rolling terrain has five access points per mile and 11-ft lanes with a 4-ft shoulder on the right side and 2-ft shoulder on the left. The peak-hour factor is 0.84 with 13% heavy vehicles. If the analysis flow rate is 1250 pc/h/ln, what is the peak-hour volume?

a) 1667 veh/h b) 1859 veh/h c) 1984 veh/h d) 3335 veh/h