Is it permitted to continue driving at a railway crossing when the barrier is in motion, descending or rising?

1. AIt is permitted to continue driving provided that one drives carefully.
2. BIt is permitted to continue driving when the barrier has started to rise.
3. CIt is permitted to continue driving as long as the barrier has not reached its lowered position and locked.
4. DIt is forbidden to continue driving as long as the barrier is in motion in any direction or when it is in a horizontal position.

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