NCDOT Traffic Engineering & Control 2

Question 1

NCDOT uses level of service (LOS) grades A through F to evaluate intersection operations. Which LOS indicates the worst traffic conditions with excessive delays?

Accepted Answer

LOS F

Answer

LOS F represents a breakdown of traffic flow with unacceptable delays, queuing, and congestion beyond intersection capacity.

Question 2

What does the term 'peak hour volume' represent in NCDOT traffic engineering studies?

Accepted Answer

The highest hourly traffic volume recorded during the study period

Answer

Peak hour volume is the highest traffic volume recorded in any single hour during the observation period, used to design for worst-case conditions.

Question 3

Which NCDOT document governs the design and placement of temporary traffic control (TTC) devices in construction work zones?

Accepted Answer

NCDOT Work Zone Traffic Control Manual

Answer

NCDOT's Work Zone Traffic Control Manual provides requirements for temporary traffic control devices, channelization, and safety measures in active construction zones.

Question 4

When designing a roundabout in North Carolina, which design element primarily controls vehicle speeds through the intersection?

Accepted Answer

Inscribed circle diameter and entry deflection geometry

Answer

Speed control in a roundabout is achieved through geometric deflection—specifically the inscribed circle diameter and the angle at which vehicles must turn to enter—forcing slower operating speeds.

Question 5

What is the standard NCDOT yellow change interval (yellow clearance time) purpose at a signalized intersection?

Accepted Answer

To warn drivers that the green phase is ending and they should prepare to stop

Answer

The yellow change interval warns drivers that the green phase is ending, providing time to decelerate and stop before the signal turns red.

NCDOT - North Carolina Department of Transportation Practice Test

NCDOT - North Carolina Department of Transportation Practice Test

NCDOT Traffic Engineering & Control 2