A bus is stopped at a bus stop on a 50 km/h road but has not signalled to move off. What should the driver understand about the special yielding rule?

1. The special rule is triggered when the bus indicates its intention to start from the stop
2. It applies even if the bus gives no signal and stays parked
3. It gives the bus priority to reverse into traffic
4. It applies only after the bus reaches 50 km/h