Is a bus used for driving instruction purposes permitted to enter where the following road sign is placed?

1. No, except if it belongs to a bus company that won permission.
2. Yes.
3. Correct answer: No.
4. Yes, except for vehicles with an all up weight that exceeds 10,000 kg.

WhyA learner vehicle in a red circle prohibits entry to all driving-instruction vehicles, including a learner bus.