Have you looked closely at modern HGVs (or whatever they're called now). They mostly seem to have cameras instead of mirrors. I can't imagine the improvement of aerodynamics over the barn door front would be much advantage, so perhaps there's other reasons?
(LGV's)
Yes, I have. And no, they don't.
Granted they are becoming more common, but we are nowhere near the point that most have them (cameras rather than mirrors).
1, trucks cover massively more miles than cars, so even a small improvement in mpg is probably going to be worth doing for the benefit over the working life of the truck.
2, the mirrors fitted to trucks are huge, so the difference is going to be magnified compared to mirror vs camera on a car.
3, also because of their size, mirrors on a truck are going to be fairly vulnerable to damage. The camera is much smaller in size and (usually) mounted up at roof level.
Not sure, but I'd also imagine the cost of replacement for camera vs mirrors on a truck will be much closer (than in a car) because of the sheer size of the mirror.
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