Turn off your engine

https://pr.portlandtribune.com/article/The-Weinstein-Firm-Addresses-Rising-Atlanta-Motorcycle-Fatalities-and-New-Legal-Challenges-Under-Senate-Bill-68?storyId=69fa65b6cdd5c000024f22ba

Turn off your engine and put the vehicle in park to prevent rolling; set the parking brake if the car is on an incline or slope.