Traffic Management & Control Systems Flashcards
7 cards from real NETTCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Traffic Management & Control Systems flashcards as text
A traffic engineer is reviewing detector occupancy data and notices values consistently above 80%. This most likely indicates:
Answer: Highly congested or stopped traffic over the detector
High occupancy percentages mean vehicles are sitting over the detector for long periods, which is characteristic of stop-and-go or queued traffic.
In signal timing design, the 'lost time' per phase accounts for:
Answer: Start-up lost time and clearance lost time during which the intersection is not efficiently used
Lost time includes start-up delay as queued vehicles react and clearance time during the yellow and all-red, representing time the phase is not fully productive.
Which technology allows a traffic management center to remotely adjust signal timing plans without a technician visiting the cabinet?
Answer: Central signal control via fiber optic or wireless communication network
A central signal control system communicates with field controllers over a network, enabling operators to push updated timing plans remotely.
What is the primary reason for using a 'lag left-turn' phase instead of a 'lead left-turn' phase at a signalized intersection?
Answer: A lag phase can reduce the overall cycle length and improve operations in certain traffic conditions
A lag left-turn phase occurs after the opposing through movement, which can reduce cycle length and improve coordination under certain demand patterns.
In New England states, winter maintenance operations often require coordination with traffic management because:
Answer: Plowing and anti-icing activities affect detector accuracy and require adjusted signal timing or worker protection plans
Snow and ice can cover loop detectors and alter traffic patterns, requiring recalibration of detection and work zone signal plans to protect maintenance crews.
A 'wrong-way driver' alert system on a freeway typically uses which combination of technologies?
Answer: Wrong-way detection cameras or sensors combined with DMS and motorist alert systems
Wrong-way detection systems use sensors or video at exit ramps, then activate DMS warnings and notify motorists and law enforcement in real time.
The NETTCP program emphasizes that technicians performing work in or near travel lanes must comply with which foundational safety standard?
Answer: MUTCD Part 6 — Temporary Traffic Control (Work Zone) standards
MUTCD Part 6 establishes all requirements for temporary traffic control in work zones, including device placement, taper lengths, and worker protection.