MUTCD R10-19P · Regulatory signs
Supplemental plaque with symbol indicating photo enforcement
What it means
Supplemental plaque with symbol indicating photo enforcement.
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 R10-19P.)
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.
- R10-17a Allows right turn on red arrow after coming to complete stop
- R10-18 Traffic laws are enforced by photo surveillance
- R10-18a Traffic signal violations are photo enforced
- R10-19aP Supplemental plaque indicating photo enforcement
- R10-22 Instructs bicycles to wait on designated line to request green signal
- R10-23 Requires stopping at crosswalk when signal is red
