[Dan(9698)]

Cars now have an RPM limiter. Our Lincoln is limited to
3000 RPM in neutral.

Hold the gas to the floor and the engine sputters and sounds awful. It turns off the fuel injectors to limit
the RPM.

How about just turn off the ignition? You don't have to turn the key far enough to lock the steering.

[Spktyr]

The Toyotas most likely to do this often do not have a physical key; they rely on a ‘smartkey’ and a push-button ignition.

[steve86]

The other comment mentioned that some vehicles do not utilize physical keys which is true. However, I would be much more comfortable in that case having a BIG RED PANIC BUTTON which acts like a master breaker and cut-out switch. The RPM limiter is a good idea but can malfunction (sensor, short, open circuit, logic fault, etc), as could the panic button for that matter. How about an anchor you can throw out?