Some Bike Infrastructure Is Worse Than None at All

Denver gave rise to the sharrow in the early 1990s, and now two researchers there offer a compelling case to put the lowly form of bike infrastructure to rest.

You’ve seen a sharrow painted on city streets: it’s that image of a cyclist below two arrows in the middle of a lane that—you guessed it—is meant to be shared by bikes and cars. The Federal Highway Administration gave sharrows its official blessing in 2009, and the symbol is now ubiquitous across urban America. It’s also arguably the least-loved nod to cycling, a low-cost way for cities to say they’re doing something about safety and street design without really doing much at all.