When preparing to leave the school after unloading, start the engine, release the parking brake, and _________.

When all students are accounted for, prepare to leave by:
- Closing the door.
- Fastening safety belt.
- Starting engine.
- Engaging the transmission.
- Releasing the parking brake.
- Turning off alternating flashing red lights.
- Turning on left turn signal.
- Checking all mirrors again.
- Allowing congested traffic to disperse.