NETTCP Traffic Management & Control Systems 2

Question 1

What is the primary purpose of an Adaptive Traffic Control System (ATCS)?

Accepted Answer

Dynamically adjust signal timing based on real-time traffic conditions

Answer

ATCS uses real-time detector data to continuously optimize signal timing, reducing delays compared to static timing plans.

Question 2

A queue detector in a traffic signal system is typically placed at what location?

Accepted Answer

Upstream of the intersection to detect spillback

Answer

Queue detectors are positioned upstream to sense vehicle backup before it blocks upstream intersections or driveways.

Question 3

In traffic signal coordination, 'bandwidth' refers to:

Accepted Answer

The range of green time available for vehicles to travel through multiple coordinated signals

Answer

Bandwidth is the window of time (in seconds) during which vehicles can progress through a series of coordinated signals without stopping.

Question 4

Which type of traffic count device uses pneumatic road tubes to detect vehicles?

Accepted Answer

Portable axle counter

Answer

Pneumatic road tube counters record axle hits as air pulses, making them portable axle counters used for short-term traffic studies.

Question 5

What does the term 'saturation flow rate' mean in traffic engineering?

Accepted Answer

The maximum throughput of a lane when vehicles move in a continuous queue under green

Answer

Saturation flow rate is the maximum number of vehicles per hour that can pass through a lane group during an uninterrupted green phase.

(NETTCP) New England Transportation Technician Certification Program Practice Test