Left Lane Must Turn Left Sign
Vehicles in the left lane are required to turn left at the intersection
What to do
If you do not want to turn left, move out of the left lane before the intersection.
Tips
Check lane-use signs and pavement arrows early.
Test yourself
You see this sign while driving. What do you have to do?
Show the answer
If you do not want to turn left, move out of the left lane before the intersection.
Common mistake
Going straight from a mandatory-turn lane
About regulatory signs
Regulatory signs are usually white rectangles with black or red markings, and they carry the force of law — speed limits, turn restrictions, right-of-way. Ignoring one is a traffic violation. The written test regularly checks whether you know exactly what a regulatory sign requires you to do.
Practice questions about this sign
A driver in the left lane at this sign must:
- A. Merge right before the intersection
- B. Continue straight through the intersection
- C. Turn left at the upcoming intersection
- D. Yield to all cross traffic before turning
Show answer
C. Turn left at the upcoming intersection — This sign marks a mandatory turn lane. A driver who does not want to turn left must move out of that lane before reaching the intersection.
Universal rule · checked against MUTCD 11th Edition, Part 2 — Signs (General) — Traffic Signs — General · verified 2026-08-01
Frequently asked questions
What does the Left Lane Must Turn Left Sign mean?
Vehicles in the left lane are required to turn left at the intersection
What should you do at a Left Lane Must Turn Left Sign?
If you do not want to turn left, move out of the left lane before the intersection.
Reference standard: Federal Highway Administration Manual on Uniform Traffic Control Devices ↗. State and local agencies may add rules or operating times, so follow the complete posted sign where you drive. How DMV Prep sources content.
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