It's a bit like trucks indicating to move out and expecting others to drop anchor so they can pull out and so save themselves having to lose momentum or brake. Heavan forbid having any courtesy to drivers who are doing 70 and are feet from the rear of their trailer...
My dad had an accident last year when a foreign lorry pulled out into lane two and hit him on the M25 near Dartford. His car was written off, but he was just fine thankfully.
Now in this case, I expect it was the driver not using the mirrors properly - but I've seen plenty of occasions where a lorry indicates and pretty much pulls out straight away - forcing others to very rapidly brake or change lane. If you just stood your ground, you'd lose.
I don't see this as bad use of mirrors, but sheer arrogance and the belief built up over time that a lorry is so big, you can force others to move. And most of the time they will, given the most likely outcome of a lorry taking on a car.
If I can see from a distance that a lorry is gaining on any other vehicle, or indeed any car gaining on another, I will quite often seek to pass in lane 3 and then back in to let them sort themselves out and not bring me into their game.
That's also indicative (sorry!) of the number of drivers who use indicators to inform you that they have actually started a manoeuvre; rather than the proper use of letting you know they intend to make a manoeuvre.
Ah yes. The ones that have already begun to move over the line so you already know what they're doing - but flick on the indicator as if they could only do it by pulling/pushing the lever when they are turning the wheel. Using mirrors must be far too difficult for these people.
I was once advised to have one flash of the indicator for every 10mph of speed. Some motorists make do with a single flash. Our car can't do any less than three flashes whether we like it or not.
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