Proximity key - Anyone know what happens if you walk away while engine is running?

[Canadian]

On several occasions, I've gotten out of the car (3.8 sedan) with the key in my pocket. There is long beep audible inside and outside the car. But what happens if I keep walking? Recently, I almost let my brother-in-law drive away while I had the key in my pocket. Would the car run until he turned off the ignition and then he'd be stranded? Would it stall after a certain distance or elapsed time? Anyone tested this yet?

 

[Dimitry]

It keeps going. And going.

I learned this when the valet drove away without my keys once

 

[STREETS]

The car will BEEEEEEEP for about 10 seconds alerting you that you or another person is leaving with the key- and car is still running.

 

[JOwest]

The engine will continue to run after the beeping and the car can be driven like normal until someone turn off the engine. It won't start again without the key. It will say "Key not in car".

 

[Mark_888]

The engine will continue to run after the beeping and the car can be driven like normal until someone turn off the engine. It won't start again without the key. It will say "Key not in car".

I guess that feature comes in handy if one is the victum of a car-jacking.