Traffic Engineering & Control Flashcards
7 cards from real NCDOT 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 Engineering & Control flashcards as text
According to NCDOT standards, what is the minimum sight distance required at a stop-controlled intersection on a road with a posted speed of 45 mph?
Answer: 415 feet
NCDOT follows AASHTO guidelines requiring approximately 415 feet of stopping sight distance for a 45 mph posted speed at stop-controlled intersections.
Which MUTCD-compliant sign color is used for NCDOT guide signs on the state highway system?
Answer: Green with white legend
MUTCD specifies green with white legend for highway guide signs indicating destinations and distances on state highway systems.
What is the standard minimum lateral clearance from the edge of travel lane to a fixed roadside object on a primary North Carolina highway?
Answer: 6 feet
NCDOT design standards require a minimum 6-foot lateral clearance from the edge of the travel lane to fixed objects on primary highways.
Under NCDOT traffic signal timing guidelines, what term describes the total time for a traffic signal to complete one full cycle through all phases?
Answer: Cycle length
Cycle length is the total time, in seconds, for a traffic signal to complete one full sequence of all signal phases.
Which traffic study does NCDOT primarily require to determine if a traffic signal is warranted at an unsignalized intersection?
Answer: MUTCD warrant analysis
NCDOT requires a MUTCD warrant analysis using the eight warrants defined in the Manual on Uniform Traffic Control Devices to justify signal installation.
What is the purpose of a left-turn overlap phase in NCDOT signal design?
Answer: Provides additional green time to a left-turn movement concurrent with a non-conflicting phase
An overlap phase grants additional green time to a movement—such as a left turn—when it can safely operate concurrently with another non-conflicting phase.
According to NCDOT standards, pavement markings that delineate the edge of the roadway on the right side are typically what color?
Answer: White
MUTCD and NCDOT standards specify white edge line markings on the right side of the roadway to delineate the boundary of the travel lane.
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