MUTCD R16-3 · Regulatory signs
Requires drivers to move over or reduce speed when passing vehicles stopped on the shoulder
What it means
Requires drivers to move over or reduce speed when passing vehicles stopped on the shoulder.
What to do about it
It is a regulatory sign: it states a law you must obey, not a suggestion. Ignoring it is a citable violation. (MUTCD R16-3.)
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 regulatory signs series — the ones most easily mixed up with it.
- R15-6a Alternative design prohibiting vehicles from driving on railroad tracks
- R15-7 Transit rail crossing on a divided highway
- R15-7a Transit rail crossing on a divided highway at a T-intersection
- R15-8 Instructs to look both ways before crossing railroad tracks
- R16-4 Instructs drivers to move vehicles out of travel lanes after minor crashes
- R16-5 Requires headlights to be turned on when windshield wipers are in use
