Crossbuck signs indicate:

  1. Railroad crossings. ✓
  2. School zones.
  3. No passing zones.
  4. Hospitals.

Answer: A. Railroad crossings.

Crossbuck signs mark railroad crossings, and you must yield the right-of-way to trains there.

Why this is the answer

The handbook's railroad crossing section describes the crossbuck as a yield sign, and it says a sign beneath the crossbuck shows how many tracks there are when more than one track exists. Since the crossbuck belongs to the set of railroad crossing signs and signals you meet as you approach a highway-railroad crossing, the sign tells you a crossing is ahead and that trains have the right-of-way over you.

Why the other answers are wrong

Remember it

Picture the crossbuck as a giant X of wooden rails, and treat it like a yield sign where the train always goes first.

Official handbook: Florida Driver License Handbook (FLHSMV), 6. Traffic Controls – Specialized Signs and Signals, p. 56

Explanation drafted with AI (deepseek-flash) from the official handbook passage cited above, then checked automatically and by a second model on 2026-10-23. Always confirm with the official handbook.