I've come to the conclusion that not only have most british drivers not taken a driving test, they haven't a clue as to what a test is. They sit in a car with various buttons and levers which are beyond them and just 'push the pedal to the metal'.
The concept of informing other drivers what they are doing is totally alien, as is that of following simple instructions from roadside signals.
Leading in and out of Birmingham (UK) there is a short stretch of rad at motorway standard which has a 'tdal flow'. The idea is simple. Sometimes there are 3 lanes in each direction, sometimes 2 in and 4 out or vice-versa, all controlled by overhead lights. There is always a dead lane in-between to separate traffic approaching each other at up to 100 mph (or more if speed limits are ignored0. Regularly in this 'BMW lane' (think about it) drivers enter and just drive. How it that we haven't had a major Incident I don't know - but it will make one HELL of a mess!!