NETTCP Traffic Management & Control Systems 4

Question 1

A traffic engineer notices that vehicle queues from one intersection are blocking the stop bar of an upstream intersection. This condition is called:

Accepted Answer

Spillback

Answer

Spillback occurs when downstream congestion causes queues to extend back and block upstream intersections, disrupting signal coordination.

Question 2

What is the purpose of an 'all-red' clearance interval at a traffic signal?

Accepted Answer

Provide time for vehicles and pedestrians to clear the intersection before conflicting movements begin

Answer

The all-red interval holds all approaches on red simultaneously, providing a safety buffer for vehicles that entered on late yellow to clear before cross traffic receives green.

Question 3

In ITS, a 'Video Incident Detection' (VID) system is designed to:

Accepted Answer

Automatically identify incidents such as stopped vehicles or wrong-way drivers using camera feeds

Answer

VID algorithms analyze CCTV feeds to detect anomalies like stalled vehicles, debris, or wrong-way driving and alert operators.

Question 4

Which federal manual establishes uniform standards for traffic control devices including signs, signals, and pavement markings in the United States?

Accepted Answer

Manual on Uniform Traffic Control Devices (MUTCD)

Answer

The MUTCD, published by FHWA, is the national standard governing the design, placement, and operation of all traffic control devices on public roads.

Question 5

What is 'traffic signal coordination' intended to achieve on an arterial?

Accepted Answer

Create a 'green wave' so vehicles can travel through multiple signals without stopping

Answer

Coordination offsets green phases along a corridor so a platoon of vehicles traveling at the design speed encounters mostly green lights.

(NETTCP) New England Transportation Technician Certification Program Practice Test

(NETTCP) New England Transportation Technician Certification Program Practice Test

NETTCP Traffic Management & Control Systems 4