It is probably someone just not thinking, best to assume everyone on the road is a distracted idiot and you won't be far wrong !. I had someone pull out in front of me at at T Junction last week, I had to do a full emergency stop with most of the contents of the car flying forward at high speed. I have no idea how or why they failed to see my car.Fair enough. I’m not telling anyone how they should be driving. Just trying to understand the mindset of why >car-length gaps have seemingly now become necessary (and not in the past).