## PEC EPE Exam Traffic Engineering MCQ and Numerical Questions

### Other PEC EPE Exam Past Paper Questions

What is the purpose of a traffic impact study?

a) To evaluate the impact of new development on traffic flow

b) To measure vehicle emissions

c) To assess road surface conditions

d) To design highway intersections

Answer: a

The term “LOS” in traffic engineering stands for:

a) Level of Service

b) Length of Signal

c) Load Over Surface

d) Lane Occupation Speed

Answer: a

What does the “85th percentile speed” represent?

a) The average speed of vehicles on a road

b) The speed of the fastest vehicle on the road

c) The speed at which 85% of vehicles are traveling at or below

d) The speed limit on the road

Answer: c

Which traffic control device is used to regulate the movement of vehicles at intersections?

a) Speed limit signs

b) Yield signs

c) Stop signs

d) Guide signs

Answer: c

The term “roundabout” in traffic engineering refers to:

a) A type of intersection with traffic signals

b) A one-way street

c) A circular intersection with yield control

d) An elevated highway segment

Answer: c

What is the purpose of a traffic signal coordination plan?

a) To synchronize signals to improve traffic flow

b) To increase the number of traffic signals in an area

c) To reduce the speed of vehicles approaching an intersection

d) To control pedestrian crossings

Answer: a

The concept of “Traffic Calming” aims to:

a) Increase the speed of vehicles on streets

b) Reduce traffic congestion in urban areas

c) Slow down vehicular traffic to improve safety and livability

d) Increase the width of roads

Answer: c

Which type of intersection allows free flow of traffic in all directions without conflict?

a) Signalized intersection

b) Unsignalized intersection

c) Roundabout intersection

d) Grade-separated intersection

Answer: c

The “Critical Gap” in traffic studies refers to:

a) The time taken to accelerate a vehicle to its desired speed

b) The shortest time gap between two successive vehicles entering an intersection

c) The time taken to decelerate a vehicle to a stop

d) The time gap required for a vehicle to turn left at an intersection

Answer: b

What is the purpose of a “Traffic Impact Fee”?

a) To fund public transportation systems

b) To increase fuel taxes

c) To improve pedestrian walkways

d) To finance road improvements due to increased traffic from new developments

Answer: d

Traffic Flow Calculation:

**Calculate the traffic flow rate in vehicles per hour for a road section with 1200 vehicles passing through in 30 minutes.**

Solution:

Traffic Flow Rate = (Number of Vehicles / Time) ร 60

Traffic Flow Rate = (1200 / 30) ร 60 = 2400 vehicles per hour

Level of Service Calculation:

**Determine the level of service (LOS) for an intersection with an average delay per vehicle of 40 seconds.**

Solution:

LOS is determined using delay values. Refer to standard LOS classifications to find the corresponding level based on the delay value.

85th Percentile Speed Calculation:

**Calculate the 85th percentile speed for a road where the speeds of vehicles are recorded as 50, 52, 53, 54, 55, 56, 57, 58, and 60 km/h.**

Solution:

Arrange the recorded speeds in ascending order and find the speed at the 85th percentile position.

Answer: 58 km/h

Stopping Sight Distance Calculation:

**Determine the stopping sight distance for a design speed of 80 km/h and a driver’s perception-reaction time of 2.5 seconds.**

Solution:

Stopping Sight Distance = Perception-Reaction Distance + Braking Distance

Perception-Reaction Distance = Speed ร Reaction Time

Braking Distance = (Speedยฒ) / (2 ร Deceleration)

Given: Speed = 80 km/h, Reaction Time = 2.5 seconds, Deceleration = 4 m/sยฒ (typical value for dry roads).

Calculate Perception-Reaction Distance and Braking Distance, then sum them up.

Answer: Stopping Sight Distance โ 137.5 meters

Roundabout Entry Capacity Calculation:

**Calculate the entry capacity of a single-lane roundabout with an approach width of 4.5 meters and an entry speed of 40 km/h.**

Solution:

Entry Capacity = Entry Width ร Entry Speed ร Entry Adjustment Factor

Entry Adjustment Factor depends on the circulating flow and critical headway.

Given: Entry Width = 4.5 meters, Entry Speed = 40 km/h, Entry Adjustment Factor (from tables) = 0.035.

Calculate the Entry Capacity.

Answer: Entry Capacity โ 126 vehicles per hour

Traffic Signal Cycle Length Calculation:

**Determine the cycle length of a traffic signal with 3 phases, each having green time of 30 seconds and yellow time of 3 seconds.**

Solution:

Cycle Length = Sum of Phase Times

Cycle Length = (3 ร 30 seconds) + (3 ร 3 seconds) = 99 seconds

Traffic Calming Measure Effectiveness Calculation:

**Calculate the reduction in average speed achieved by implementing speed bumps, with the initial average speed being 50 km/h and the post-implementation speed being 30 km/h.**

Solution:

Speed Reduction = Initial Speed – Post-implementation Speed

Speed Reduction = 50 km/h – 30 km/h = 20 km/h

Intersection Delay Calculation:

**Calculate the total intersection delay for 200 vehicles passing through an intersection, with an average delay per vehicle of 25 seconds.**

Solution:

Intersection Delay = Number of Vehicles ร Average Delay per Vehicle

Intersection Delay = 200 vehicles ร 25 seconds = 5000 seconds

Gap Acceptance Calculation:

**Determine the critical gap for a driver making a left turn at an intersection, where the opposing traffic volume is 1500 vehicles per hour and the opposing traffic speed is 50 km/h.**

Solution:

Critical Gap = (1 / Opposing Traffic Flow) ร 3600 seconds

Given: Opposing Traffic Flow = 1500 vehicles per hour

Calculate the Critical Gap.

Answer: Critical Gap โ 2.4 seconds

Traffic Impact Fee Calculation:

**Calculate the traffic impact fee for a new development expected to generate an additional 500 vehicles per day, with a fee rate of $100 per vehicle.**

Solution:

Traffic Impact Fee = Number of Vehicles ร Fee Rate

Traffic Impact Fee = 500 vehicles/day ร $100/vehicle

Answer: Traffic Impact Fee = $50,000 per day