The Prepare to Stop at Railway Crossing sign indicates to drivers in advance of a railway crossing that that there is a high probability of having to stop for a railway crossing signal ahead. The primary function of this is to reduce dilemma zone incidents.

This sign should be used where traffic engineering studies have indicated that this sign is warranted. Factors which should be considered include:

1. Train and vehicle speeds
2. Train volumes
3. Traffic volumes
4. Visibility
5. Highway grades
6. Collision experience