A bus driver is preparing to leave a stop next to a row of parked cars and a low tree limb. Which combined action best follows the Maryland manual?

1. Check clearance, wait for a safe traffic gap, and do not assume other drivers will brake for the bus
2. Signal once and pull out because buses always have immediate priority
3. Watch only the tree limb because parked cars cannot move
4. Ask a passenger to watch the mirrors while the driver accelerates