Red, yes I do look out the rear window, but as MK5 GTIAN said we also have wing mirrors, so it's not my only source of visual aid. Most of my driving is in London so all fairly slow paced at best, and normally with either a bus, lorry or van behind me so cant see much out of it. What would you do if you were in a saloon? No wiper on those.
Fish
Edited to add, MKVIKen, sorry cant PM as I'm too new. Payment made.