I can do 20mph for an hour, but need to recover for an hour after that. 20mph is also where the dangerous speed starts for us cyclist because motor traffic isn

I can do 20mph for an hour, but need to recover for an hour after that. 20mph is also where the dangerous speed starts for us cyclist because motor traffic isn't used to cyclists going that far and every crossing without lights will become a bit of a gamble for the cyclist.