MUTCD R9-3c · Regulatory signs
Supplemental plaque instructing cyclists to ride with traffic flow
What it means
Supplemental plaque instructing cyclists to ride with traffic flow.
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 R9-3c.)
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.
- R9-1 Instructs pedestrians to walk on the left side facing oncoming traffic
- R9-2 Requires pedestrians to cross only at designated crosswalks
- R9-3a Pedestrians may not cross at this location
- R9-3b Supplemental plaque directing pedestrians to use designated crosswalk
- R9-4 Prohibits hitchhiking using symbol representation
- R9-4a Prohibits hitchhiking with text-based sign
