See also:

Misfuel prevention (diesel)
Mechanical device which prevents filling the tank of a Diesel vehicle with petrol. It avoids the risk of engine damage that can result from filling with the wrong fuel. Located in the filler neck ...

Forwards-backwards
Raise the control and slide the seat forwards or backwards. ...

Then one day someone has an idea.
What if, to make manoeuvring easier and increase driving sensations, the diameter of the steering wheel were reduced? And what if, to make it easier to read the information on the instrument panel ...