# Traffic Engineering Questions and Answers – Highest Hourly Volume and PHV

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This set of Traffic Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Highest Hourly Volume and PHV”.

1. The hourly volume that is exceeded only 29 times a year is known as _______
a) 30th highest hourly volume
b) Peak hourly volume

Explanation: The hourly volume that is exceeded only 29 times a year is known as 30th highest hourly volume. 30th highest hourly volume also serves for design purposes. They are economical too.

2. What is directional volume?
a) Peak hour volume
b) 30th highest hourly volume

Explanation: Directional volume is also known as Peak hour volume. Peak hour volume is the hour of the day that has the highest hourly volume. This traffic volume is used for design and operational purposes by engineers. Here each direction of flow is counted individually.

3. When are reversible lanes used?
a) When the directional imbalance is significant
b) When the directional imbalance is insignificant
c) When the traffic signal doesn’t work in one lane
d) When there is a blockade

Explanation: Reversible lanes are used when the directional imbalance is significant. Reversible lanes are lanes in which vehicles may be driven in either direction, depending on the signal. Reversible lanes are used to enhance the flow of traffic in the time of rush hours.
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4. Peak hourly volume is smaller than Design hourly volume.
a) True
b) False

Explanation: The statement “Peak hourly volume is smaller than Design hourly volume” is true. Peak hourly volume (PHV) is 5-45 % lower than Design hourly volume (DHV).

5. What happens when recommendations of traffic impact studies that use the Design hourly volume (DHV) is implemented in the Peak hour warrant?
a) Congestion
b) Installation of unwarranted traffic signals
c) Economical design of highway
d) Satisfactory design of highway

Explanation: When recommendations of traffic impact studies that use the Design hourly volume (DHV) is implemented in Peak hour warrant installation of unwarranted traffic signals occurs. This increases traffic delays and stops and might even lead to accidents.

6. How is the design year determined?
b) City planning schedule
c) National planning schedule
d) International planning schedule

Explanation: A design year is determined by a roadway network planning schedule. Roadway network planning schedules are 1, 6 or 20-year plans. Road improvements are done based on the traffic volume projected to a design year.

7. The maximum hourly traffic volume that a highway should be designed to serve without the level of service falling below a predetermined level is known as ______
b) 30th highest hourly volume
c) Design service volume
d) Peak hour volume

Explanation: The maximum hourly traffic volume that a highway should be designed to serve without the level of service sinking below a predetermined level is known as Design service volume. The acceptable level of service should be at least five years.

8. It is agreeable to choose an hourly volume for design, which is about 50 percent of the volumes expected to occur during the few highest hours of the design year, whether or not that volume is equal to the 30th highest hourly volume.
a) True
b) False

Explanation: The statement, “It is agreeable to choose an hourly volume for design, which is about 50 percent of the volumes expected to occur during the few highest hours of the design year, whether or not that volume is equal to the 30th highest hourly volume” is true. It is done so to avoid blockage during peak hours.

Sanfoundry Global Education & Learning Series – Traffic Engineering.