I've noticed it too.
Coming down the slip road the other day to join the dual carriageway, building my speed, indicating. Silver car approaching from behind moved over into the other lane to allow me to join, meanwhile a red car already travelling in the right lane whizzed back into the left hand lane just as I started to drift across, I had to slam brake hard to avoid hitting the arsehole.
Have also recently had three cyclists riding along an unlit country lane side-by-side at twilight, not a single helmet or piece of high-vis between the lot of them. That was fun on a blind bend, they were very lucky I was only going 30 as I'd been stuck behind a tractor because its a NSL road. I then had to crawl along behind them as they dilly-dallied around, making no effort to move to single file. I couldn't overtake because of oncoming traffic (main route in and out of the village) and at every bend I half expected to have someone suddenly appear doing the actual speed limit and ram straight into the back of me.
Friend of DD got knocked down by a bike on a zebra crossing recently, the man riding it said he saw her as she was about to cross but he didn't think zebra crossings applied to cyclists.
Also recently I had a car undertake me on a roundabout, a car in front of me suddenly change lanes then immediately attempt to change back again.
On local FB there was a picture shared of a small car driving along the central lane of a busy road with a surfboard lying on the backseat and both rear doors wide open and encroaching on the lanes either side, to accommodate it sticking out either side of the car.