Which of the following is true? Vehicles approaching a highway-railroad grade crossing must:

Always stop.
Stop when the crossing gate is lowered.
Not stop when the warning devices are flashing.
Stop only when an approaching train is clearly visible.
Explanation

Drivers approaching a highway-railroad crossing must slow down and be prepared to stop if the warning devices are flashing or the crossing gate is lowered. These signals indicate that a train is approaching. Warning devices are in place to alert and regulate drivers at railroad crossings. Always obey these signals - never cross when the lights are flashing or attempt to go around the gate.

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