zlacker

There was a tremendous amount of general standardisation, things we take almost entirely for granted now:

- Electric / automatic starters.

- Arrangement of controls (accelerator, brake, clutch)

- Windshields.

- Brakes.

- Brake lights.

- Turn indicators.

Various improvements to roads, signage, and lighting as well, I suspect. As well as people simply knowing what cars were and what to expect from their behaviour.