A lot of the problems with driving in the US (and indeed in the rest of the world) are due to people doing what they think is right or normal, but adversely affect everyone else. I am sure they don't think they are doing anything wrong and are happy in their own little world.
I don't believe there is a law for the "zipper procedure" when merging traffic in the UK, but people sure as hell do it. It makes merging a LOT easier and friendlier. The on-ramp/slip-road is there for a number of reasons. It allows you to reach the speed of the other drivers before entering the main road. It also allows a longer distance in which to "zip-up" the two lanes that are merging. People in the US especially do not see or do not understand that it is a merge. People on the main road have legal right of way, but strictly prioritising one lane like this will rapidly result in hold-ups for both lanes. This is especially true when people have to resort to cutting in front of others to get into the main road, and also differences in opinion when some people like to use the entire on-ramp but others prefer to stop at the beginning and merge when they see a gap.
Grow up. Use the entire on-ramp. Zip-up at the end. Get the hell out of the fast lane if someone wants to pass.
why didn't they require all major TV stations transmitting on analogue to overlay a continuous message informing people of the impending switch off starting around three months before the actual date?
Because they've spent all their budget putting these messages onto digital HD channels. Seriously, why do they insist on pissing us off by leaving 1/4 screen banner notices for the digital switchover on digital HD channels, and squashing the main content, destroying its aspect ratio? Oh, they switch off the notices when the commercials come on, because the channels care most about their precious ad revenue.