Key presses still control the car while you're exiting the vehicle

[ohgodspidersno]

To reproduce:

 

Stop the car, press the "exit vehicle key" [E]and then hold "move forward" [W]

 

The 'W' keypress will actually register as a command to the car and will re-ignite the engine. If you didn't take the key out it will make the car move forward. It is actually possible to run yourself over this way.

 

 

I don't think this is a feature, since holding 'W' while exiting vehicle is something I, personally, would do to make sure I started running the instant I'd finished exiting the vehicle.