One of the central arguments officials and advocates proffer in favor of road diets and other traffic calming measures is that they improve safety.
The reality is precisely the opposite of the rhetoric. Over the past several months people around the country have documented how “road diets” and other traffic calming measures add immeasurably to emergency response times. They also often tend to increase, not decrease accidents, injuries, and fatalities. For example, after three years of road diets and other projects under Vision Zero in Los Angeles, pedestrian fatalities have almost doubled.