It's definitely a generalization, but during my bike lane commutes or when I drive along a bike lane, I see a ton of Lycra-clad middle-aged men bent over in the

It's definitely a generalization, but during my bike lane commutes or when I drive along a bike lane, I see a ton of Lycra-clad middle-aged men bent over in there best aero positions going 20 mph+. There are not a lot of upright riders going slowly. It's definitely a generalization, it's anecdotal and specific to the streets I frequent in my Midwestern US city, but at least here it's a true generalization.