What does the sign mean?

1. AEntry is forbidden to a vehicle whose load width is greater than the width written on the sign.
2. BEntry is forbidden to a vehicle whose height is less than the height written on the sign.
3. CEntry is forbidden to a vehicle which, with or without its load, is higher than the height written on the sign.
4. DEntry is permitted only to a non-motor vehicle whose height is more than three metres.

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