Earlier quoted context omitted.
> Are there really cars where the horn is not a physical button/ring on the steering wheel? Yes: https://antiquecarmuseumofiowa.org/wp-content/uploads/1913-F... Well ... "are" is kinda stretching it...
Touché! It's interesting how early vehicles were very different in their controls, but seemed to mostly converge and stabilise for a few decades, before again diverging and changing rapidly. The Model T (Ford) had a throttle on the steering wheel and 3 pedals, but not the ones you'd expect today: https://www.fordmodelt.net/images/ford-model-t-controls_smal...
Due to regulation.
The US Congress mandated the PRNDSL quadrant for automatic transmissions. (GM had PNDSLR, and people kept shifting into reverse by accident.)