MUTCD R9-20 · Regulatory signs
Bicycles are allowed to use the full traffic lane
What it means
Indicates that bicycles are allowed to use the full traffic lane.
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 R9-20.)
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.
- R9-14 Prohibits horseback riding in the designated area
- R9-15 Prohibits snowmobile use in the designated area
- R9-16 Prohibits ATV or all-terrain vehicle use in the designated area
- R9-19P Supplemental plaque indicating exception for shoulder use
- R9-21 Requires bicycles to use only the road shoulder area
- R9-22 Requires bicycles to exit the roadway or facility
