As of the end of June 2024, there were 41.7 million licensed vehicles in the United Kingdom

Along with the vehicles, there are in excess of 68 Million people in the UK as of 2023.

That means there are LOTS of things to be aware of when on the roads.

You are travelling around in a metal box that travels at speed. 
You might walk away from an incident with another metal box, but would one of those 68 Million walk away if you hit one of them with your metal box?