NCDOT Traffic Engineering & Control 3

Question 1

In North Carolina, what minimum length of deceleration taper is typically required for a right-turn lane on a rural state highway with a 55 mph speed limit?

Accepted Answer

290 feet

Answer

NCDOT guidelines based on AASHTO require approximately 290 feet of deceleration taper length for a right-turn lane where approach speed is 55 mph on a rural highway.

Question 2

What does a double yellow center line on a North Carolina two-lane highway indicate?

Accepted Answer

No passing is permitted for traffic in either direction

Answer

A double solid yellow center line prohibits passing in both directions of travel due to restricted sight distance or other hazardous conditions.

Question 3

NCDOT's functional classification system divides roads into three principal categories. Which category includes interstates and expressways serving the highest level of mobility?

Accepted Answer

Arterial roads

Answer

Arterials—including principal arterials such as interstates—are designed primarily for mobility and carry the highest traffic volumes over longer distances.

Question 4

Which NCDOT standard governs the placement and height of overhead guide signs on interstate highways?

Accepted Answer

MUTCD with NCDOT supplemental guidance

Answer

NCDOT uses the MUTCD as the primary standard for sign placement and height, supplemented by NCDOT-specific guidance for state conditions.

Question 5

What is the primary purpose of an all-red clearance interval in a traffic signal cycle?

Accepted Answer

To clear vehicles that were legally in the intersection during the yellow phase before conflicting movements begin

Answer

The all-red clearance interval holds all movements at red to allow vehicles that entered during the yellow phase to clear the intersection before conflicting traffic receives a green indication.

NCDOT - North Carolina Department of Transportation Practice Test

NCDOT - North Carolina Department of Transportation Practice Test

NCDOT Traffic Engineering & Control 3