What should be done with the ignition of a vehicle left unattended on the parking ramp?

When a vehicle is left unattended on a parking ramp, the correct procedure is to turn off the ignition and remove the key. This is primarily for safety and security reasons. Leaving the ignition off prevents potential accidents or hazards that might occur if the vehicle were to accidentally roll or be started by an unauthorized person. Additionally, removing the key minimizes the risk of theft, as a vehicle's ignition left on can be more easily accessed and driven away by someone else.

Turning the ignition off and leaving the key in the ignition, as indicated in the selected answer, poses a significant security risk. It can attract thieves and also create a situation where the vehicle could be accidentally started. Keeping the ignition off and ensuring the key is removed safeguards the vehicle and adheres to best practices for vehicle security in parking scenarios.