norb:
Love that video ,it made me think back to just the mid 80’s when I was going home on leave ,as I drove along the A66 which didn’t have so much dual carriageway at the time and truckers used to always indicate left to let you know you can overtake ,it was like an unwritten rule …I don’t know if it still happens ….As an old scrote they where the type of truck I had as a toy .I still prefer the look of them to the modern kit
I found when driving in Ireland on the wide sections of single carriageway with hard shoulders lorries and cars travelling slow will keep over to the left so can be overtaken easier. 99% of the time the vehicle going past you will flash the hazards, and if vehicles are coming the other way they normally move over for more space, and know one beeps their horn, flashes lights or upload their dash cam ‘near miss’.