MUTCD R14-5 · Regulatory signs
Prohibits National Network trucks from using the route
What it means
Prohibits National Network trucks from using the route.
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 R14-5.)
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.
- R14-1 Designated truck route for commercial vehicles
- R14-2 Designated route for vehicles carrying hazardous materials
- R14-3 Prohibits vehicles carrying hazardous materials from using the route
- R14-4 Route that is part of the National Network for large trucks
- R15-1 Standard railroad crossing sign indicating intersection with railroad tracks
- R15-2P Supplemental plaque indicating the number of railroad tracks at the crossing
