Driver's License Test Prep
US Road Signs Regulatory Signs

What does this No Left Turn sign require of a driver in the lane where it is posted?

Square white background with a black border. A red circle with a red diagonal slash overlays a black left-turn arrow that bends from a vertical shaft to the left.
  1. A.
    Continue straight or use another approved movement; a left turn from that lane is prohibited. Correct
  2. B.
    Make the left turn only after coming to a complete stop and yielding to oncoming traffic.
  3. C.
    Make the left turn only when a green arrow is displayed on the traffic light.
  4. D.
    The prohibition applies only during the hours shown on a plaque mounted below the sign.
The Why

The answer is "Continue straight or use another approved movement; a left turn from that lane is prohibited."

The sign forbids a left turn from that lane at any time, so a driver must continue straight or use another approved movement. The trap is the time-of-day answer, which reads the exception as the base rule; a supplemental time plaque is needed to limit the prohibition to certain hours, and without one the sign applies full-time.

Why the others miss

The traps in the wrong answers

B. Make the left turn only after coming to a complete stop and yielding to oncoming traffic.

A left turn from that lane is not permitted at all; stopping and yielding does not create an exception to the prohibition. This answer treats the sign like an unprotected left-turn scenario where yielding to oncoming traffic grants entry into the turn.

C. Make the left turn only when a green arrow is displayed on the traffic light.

The prohibition holds whether or not the signal shows a green arrow; the sign controls the movement, not the signal indication. This answer confuses the flat prohibition with a protected-left-turn signal that permits the turn only on a green arrow.

D. The prohibition applies only during the hours shown on a plaque mounted below the sign.

A time plaque must be mounted below to limit the prohibition to certain hours; without one the sign applies at all times. This answer reads the supplemental time-plaque exception as the base rule and assumes limited hours when no plaque is posted.

The Rule

This question tests your knowledge of Regulatory Signs on the roads of every US state . Source: Manual on Uniform Traffic Control Devices, sign R3-2 (No Left Turn)..

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