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TPCB Professional Traffic Operations Engineer Practice Sample Questions:

1. A road safety audit identifies a high-crash location due to inadequate lighting. The engineer proposes a countermeasure with a Crash Modification Factor (CMF) of 0.70. If the current crash rate is 10 crashes per year, what is the expected crash rate after implementation?

A) 7 crashes/year
B) 5 crashes/year
C) 9 crashes/year
D) 3 crashes/year

2. What does density measure in traffic engineering?

A) The distance traveled per unit of time
B) The number of vehicles in a given length of roadway or lane
C) The number of vehicles passing a point per hour
D) The time between successive vehicles passing a point

3. A freeway segment with a base capacity of 2,400 passenger cars per hour per lane is adjusted for 10% trucks (PCU = 2.0) and a PHF of 0.90. What is the adjusted capacity per lane?

A) 2,240 vehicles/hour
B) 2,080 vehicles/hour
C) 1,920 vehicles/hour
D) 2,160 vehicles/hour

4. What is the purpose of a clearance interval in traffic signal timing?

A) To allow pedestrians to cross the intersection
B) To provide time for vehicles to clear the intersection before conflicting movements begin
C) To synchronize signals at adjacent intersections
D) To extend the green phase for high-volume traffic

5. An intersection is STOP-controlled on the minor approach. The design speed of the major road is 50 mph.
The major road is 1 lane in each direction, terrain is level. What is the required intersection sight distance for a single-unit truck wishing to make a left turn onto the major road?

A) 750 feet
B) 698 feet
C) 625 feet
D) 423 feet

Solutions: