If you say so. I'm pretty sure just turning the car off if there's nobody sitting in any of the seats and the key is not in the car would be a good start.
* Rising Carbonmonoxide levels * No weight on driver seat for 3 minutes * No driving activity for 3 minutes
The first factor alone should already prompt a shutdown though. It wouldn't even matter if the key was in the car, that might happen by accident and isn't a terribly good indicator.
With the remote start system I have a passing familiarity with, if you remotely start the car and warm it up with no person and no key in the car, the car automatically shuts off fifteen minutes after it has started if someone doesn't get in with a key. Seems to be compatible the simple guidelines I mentioned.
I'm not sure why remote-start exists if it's forbidden to use it.
It also breaks the backup mechanism for no-battery situation where you can tap the fob on where the ignition lock would be for key cars to start it up.
Those people don't need to take the car key with them, but with a keyless car you don't think about the key (that's the entire point of keyless cars). The key is just one of many things in your pockets.
For animals that's different of course. But wouldn't an override be enough?
This was in the late 80s. The car wasn't running. It was a mechanical e-brake. I know a lot of cars have electronic parking brakes now, but most probably still don't.
On another note, I can't think of a single car that will let you take it out of Park without a foot on the brake, or without using an override.