Nate Silver’s FiveThirtyEight is the go-to site if you are a stats geek. Planner Gretchen Johnson and MIT PhD candidate Aaron Johnson munch the stats on bike lanes to answer the question: do bike lanes increase car traffic congestion? It’s an important issue; whenever bike lanes are proposed (or a politician like Toronto’s Rob Ford, who hates them, gets elected) the complaint is that obviously, if you take space away from cars it is going to slow down traffic. Except it is not so obvious.
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