I nod at all bikers, it's kind of a club thing being a minority group maybe. Even if some of them are to ignorant to respond or maybe there just hanging on for grim life!!!lol I've noticed that other groups like sports car owners and camper vans do it to, by flashing their lights.
I'm dreading going on the Wootton Basset run, f
g heads gonna fall off!!!!!!!!!!!!!!!