Opening car door from inside when locked?

How is it dangerous if you have the fob? You wouldn't lock yourself into a room and declare it to be dangerous because you can't get out without using the key. Perhaps a better experiment would be to get an another person to lock you in the vehicle and see if you can get out.

Won't work with double locking.

Most modern cars do that.

On any VW product when you turn off the engine and open the drivers door you get a message on the dash saying "check safelock" to remind you that the car has deadlocks.

When you get out of the car and press lock on the keyfob the inner door handles wont work but if you press lock twice in quick succession then they will work from the inside but not the outside, although i've no idea why you'd want that really.

I don't think it's really a danger, it's up to the operator to know how to use it and you shouldn't really be locking people in the car, particularly if you don't fully understand how the locks work.

Surprisingly still an optional extra on VW, Skoda, Audi etc Irish spec.

So the driver forgetting that they have left someone in the car is the manufactures fault! It's a feature of cars for at least 20 years and only now is it a safety issue.

Force of habit can cause a person to lock people into a car. And that does not necessarily make you a stupid person.

For example, I am usually alone in the car. When I get petrol, I automatically lock the car when I go into the shop to pay for it. I have also done this a few times when there is a person in the car.

Not a comfortable feeling for the person left in the car.

There is pros and cons. The pro is that it reduces the chance of someone robbing your valuables or car. It's adjustable on some cars such as pressing lock twice. Main thing it stops someone bending door out at top and fishing or unlocking cars. This is very common to steal valuables, it does not break the window glass and can be done with practice with zero tools using knees and force. They often try dozens of cars in an estate in a row, first checking are they unlocked, (very common) and then looking in windows for valuables or coats on seats. They then try to open quietly often by bending out top of door.

Sometimes cars also lock doors above a certain speed, say 20km/h partly to prevent randomers opening doors at traffic lights and stealing handbags from passenger seats.

In one model of BMW there was a water sensor in case car drove into a river. It would automatically unlock the doors and open the window, but opened window on wrong side due to eu/UK differences. There was a recall or software update. Sometimes these safety devices can be mis used by thieves such as hitting bumper to trigger airbags, which also unlocks the doors.