A not-so-common occurrence for car drivers, but more so for truckers, is for them to indicate to the left if the road ahead is clear, to indicate that it's safe to overtake.
SA06 LSE being a clueless idiot. I'd driven slowly to let them merge seamlessly in, but oh no they just go straight on from the right only lane.
...
https://www.youtube.com/watch?v=lFlX8KZqjNE
00:00 Footage of AC (Scotland) factory, and handover to first buyer.
1:39 Test drive and interview with David McDonald.
6:14 Ford Films 'Rhythm of the Road' 1936 Ford V8 cinema advert at the end
...
https://www.youtube.com/watch?v=fntruysexc4