Originally Posted by KD5NRH

Not necessarily; we've got plenty of little old ladies locally who drive their tiny cars as if they're on a 30mph residential at all times. They'll go 30 down a stretch of 60mph highway connecting the city proper with a couple of outlying housing developments "because I'm just going a couple miles" and yet the big rigs manage to not flatten them in spite of a speed differential double that of a 15mph cyclist in 30mph traffic. Same for the RV hillbillies in their self-propelled singlewides; I've been stuck behind one for 14 miles on a two-lane 75mph highway going 40. While there were some unsafe pass attempts by other cars, nobody got rear ended because of the speed differential.