aprobify.
California road sign W10-9 — Trains do not sound horn at crossing

MUTCD W10-9 · Warning signs

Trains do not sound horn at crossing

What it means

Warns that trains do not sound horn at crossing.

What to do about it

It is a warning sign: the yellow diamond warns of a condition ahead so you can slow down and be ready before you reach it. (MUTCD W10-9.)

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 app

Sign 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 warning signs series — the ones most easily mixed up with it.

Cookie preferences

Necessary

Required for the site to work: security, load balancing and remembering the choices you make here. These cannot be turned off.

Always

Analytics

Google Analytics 4. Tells us which pages people read and where the study material falls short. We look at it in aggregate, never to identify you.

Advertising

Measuring how well our ads work. We run no advertising tags on this site today; the category exists so that any we add later stays blocked unless you allow it.