Why Bike Lanes With Lots of Bike Traffic Can Still Appear “Empty”

Wherever there is a bike lane, there is probably an angry driver complaining that it is always empty.

San Francisco’s Market Street bike counter. Photo: U.S. DOT

That tends to be the case even when plenty of people do use the bike lane. And there are reasons for that, writes University of Minnesota professor David Levinson. Mathematical, geometrical reasons. Like the fact that free-flowing bike traffic will look much sparser than gridlocked car traffic, even when the number of cyclists using the bike lane is the same as the number of motorists in an adjacent car lane.

“The view from the dashboard, from the front window of the car, is going to be looking at the view of cars and the density is high,” Levinson told Streetsblog. “And you’re going to look at the other lane and see there’s no bicycles in it and you’re going to think nobody’s using it.”

Read the rest of the story here.