Surprising highway code rules

Have driven since 20 years old. At 40 got a bike license. Now 47.

It wasn't until I did the second license that I realised that all of these people that I thought were idiots by driving their car with just side lights on in the evening were actually right because it is allowed as long as there are street lights.

The other rules that surprised me is that you don't need to stop for a zebra crossing unless somebody has actually got their foot touching the zebra crossing itself.

What rules surprise you?