— Cars tend to drive closer to bicyclists who are wearing helmets. That comes from Ian Walker, who set up a bicycle with sensors and drove around the city. Vehi

— Cars tend to drive closer to bicyclists who are wearing helmets. That comes from Ian Walker, who set up a bicycle with sensors and drove around the city. Vehicles tend to crowd closer to him when he was wearing a helmet than when he wasn't. That's not necessarily surprising, but it's a reminder of all the weird unconscious tics we adopt while driving and making on-the-fly assumptions. This is a weird adaptation of the Peltzman effect[1], which found that people drove more recklessly when wearing seatbelts. [1] http://gregmankiw.blogspot.com/2006/07/peltzman-effect.html http://gregmankiw.blogspot.com/2006/07/peltzman-effect.html