Danal
electricmotorglider.com
Show me a driving school or government publication that suggests this method, or show me research that recommends it. There is none, and there's a very good reason for that, because it's simply DANGEROUS to do it.
Actually, there was a definitive research paper by the Society of Automotive Engineers that suggested it in 1995 that pretty much settled the question so clearly that I don't think there has ever been other research into the question. It has never been discredited and there are absolutely driving schools that teach it and insurance companies that recommend it.
Here is the BSGE method, straight from a Government Server URL. In fact, the National Highway and Traffic Safety Administration: http://www.nhtsa.gov/staticfiles/nti/teen-drivers/pdf/blindzoneglaremirrormethod.pdf