When must you wait at this traffic sign?

The sign displayed is a warning sign for railway crossings. When you see this sign, it's crucial to be aware of specific conditions that require stopping.

You must wait in these situations:

1. When a railway employee is waving a white-red-white flag, signaling that a train is approaching or that it is unsafe to cross.
2. If the level crossing cannot be crossed without stopping on it, because this can pose a danger to both trains and vehicles.
3. When a rail vehicle is approaching, as this indicates a clear need to halt for safety reasons.

Understanding these circumstances is essential for ensuring your safety and the safety of railway operations. Always be vigilant when approaching railway crossings and respond appropriately to signals and signs.