MUTCD R2-4 · Regulatory signs
Minimum speed limit that vehicles must maintain
What it means
Indicates the minimum speed limit that vehicles must maintain.
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 R2-4.)
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.
- R2-2aP Specific speed limit for buses only
- R2-2bP Specific speed limit for both trucks and buses
- R2-2cP Specific speed limit for vehicles over 5 tons
- R2-3P The speed limit that applies during nighttime hours
- R2-4a Both the maximum and the minimum speed limits on this road
- R2-5aP The speed limit applies citywide unless otherwise posted
