They were popular when traffic wasn't clocking 80mph.
It drives me crazy how so many ignorant guys will put that "cool" looking crap over their brake lenses reducing the light emitted and raising the danger to their posterior. I'm sure in the laws somewhere it is stated how much light must be emitted. I'm all for freedom to doll up your truck anyway you want, but when it increases the likelihood of me running up your backside...
