Civil Engineering PE Transportation and Traffic Engineering 3

Question 1

A two-lane highway has a directional split of 60/40 and a PHF of 0.90. The directional design hourly volume (DDHV) based on an AADT of 12,000 vpd and a K-factor of 0.10 is:

Accepted Answer

720 vph

Answer

648 vph

Answer

800 vph

Answer

540 vph

Question 2

For a level terrain two-lane highway, HCM defines LOS E as the level where percent time-spent-following (PTSF) exceeds:

Accepted Answer

80%

Answer

65%

Answer

75%

Answer

90%

Question 3

A driver traveling at 55 mph requires an emergency stop. Assuming a deceleration rate of 11.2 ft/s² and 0 perception-reaction time, the braking distance is approximately:

Accepted Answer

264 ft

Answer

330 ft

Answer

198 ft

Answer

440 ft

Question 4

In traffic flow theory, the Greenshields linear speed-density model assumes that speed decreases linearly from free-flow speed (uf) to zero as density increases from 0 to jam density (kj). The maximum flow occurs at density:

Accepted Answer

kj/2

Answer

kj/3

Answer

kj/4

Answer

2kj/3

Question 5

The warrant for a traffic signal based on MUTCD Warrant 1 (Eight-Hour Vehicular Volume) requires that the minimum vehicular volumes must be met for at least:

Accepted Answer

8 hours of an average day

Answer

4 hours of an average day

Answer

12 hours of an average day

Answer

2 hours of an average day

Question 6

A vertical curve connects a +3% grade to a −2% grade. The algebraic difference in grades (A) used to compute curve length is:

Accepted Answer

5%

Answer

1%

Answer

3%

Answer

2%

Question 7

According to AASHTO, the minimum length of a crest vertical curve for a design speed of 60 mph based on stopping sight distance (SSD ≈ 570 ft) is computed using K-value. The K-value for 60 mph design speed on a crest curve is approximately:

Accepted Answer

151

Answer

114

Answer

84

Answer

61