MUTCD W4-6R · Warning signs
Additional right lane when entering the roadway
What it means
Indicates an additional right lane when entering the roadway.
What to do about it
It is a warning sign: the yellow diamond warns of a condition ahead so you can slow down and be ready before you reach it. (MUTCD W4-6R.)
Practice this on the real test format
Signs are the part of the DMV written test people fail on, because reading them is a skill rather than a fact to memorize. Aprobify drills all 1034 of them, and tells you why each answer is what it is.
Get the appSign designations follow the MUTCD and the California MUTCD published by Caltrans; meanings are checked against the California Driver's Handbook (DL 600, rev. 6/2025). Edited by Fernando Aguilera. Aprobify is not affiliated with the California DMV.
Signs in the same family
These sit next to it in the warning signs series — the ones most easily mixed up with it.
- W4-5aP Supplemental plaque indicating no merge area available
- W4-5L Vehicles entering the roadway to merge left
- W4-5R Vehicles entering the roadway to merge right
- W4-6L Additional left lane when entering the roadway
- W4-7L Heavy traffic merging from the left
- W4-7R Heavy traffic merging from the right
