Pedestrian zones and bike lanes, increased access to green space, investing in sustainable infrastructure — all may lead to a more enlightened metropolis. But according to a study by two academics, one of the easiest, cheapest route to improving a city may be re-routing, specifically, eliminating one-way streets. John Gilderbloom and William Riggs’ paper Love is a Two-Way Street suggests that, while it may not seem like such a dramatic change, altering traffic patterns can make a massive impact, reinforcing their notion that “streets are the lifeblood of cities.” Their research shows the shift cuts the risk of collision or injury in half.

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