MUTCD R3-27 · Regulatory signs
No straight through — you must turn
What it means
No straight through — you must turn
What to do about it
You may not travel straight through the intersection; you must turn. (MUTCD R3-27, Section 2B.26.)
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.
- R3-19a Start of a median lane reserved for U-turns
- R3-19b Median lane where both U-turns and left turns are allowed
- R3-20L Beginning of a left-turn lane
- R3-20R A right-turn lane begins here
- R3-33aL Vertical version of the left lane must exit sign
- R3-33aR Vertical version of the right lane must exit sign
