Driving with no key

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So after reading how to do this on a BMW I thought I'd try it on my girlfriend's countryman.

Basically start the car, turn it off, remove key, press start button again. Car starts and runs without the key.

Does anyone know if this feature is for a particular purpose? It seemed to be fine, no steering lock or anything.

Just wondering why there is the ability to do this?

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I think you have 10-15 seconds to do the restart. And clutch needs to be down aswell I guess.