MUTCD R16-10 · Regulatory signs
Beginning of a section where daytime headlight use is required
What it means
Indicates the beginning of a section where daytime headlight use is required.
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 R16-10.)
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.
- R16-6 Requires headlights to be turned on when it is raining
- R16-7 Instructs drivers to turn on headlights for the next specified distance in miles
- R16-8 Instructs drivers to turn on their headlights
- R16-9 Instructs drivers to check their headlights for proper operation
- R16-11 End of a section where daytime headlight use is required
- R16-15 Prohibits the use of hand-held phones while driving
