I assume they are still in use, but much less obviously than when I was growing-up and about half the folk on our road had one! If you go along narrow country

I assume they are still in use, but much less obviously than when I was growing-up and about half the folk on our road had one! If you go along narrow country roads in NI you can find many of the mirrors re-purposed in a vertical orientation opposite blind-exits, as they give a fisheye-type view of the road either side of the junction.