Arguments For and Against
Proponents of road diets generally believe key benefits include lower vehicular speeds, reduced crash rates, and improved pedestrian safety. Other benefits of road diets include promoting better land use, reducing induced traffic, promoting greater driving attentiveness, and promoting cycling through the addition of bicycle lanes. Providing dedicated left turn (in countries that drive on the right-hand side of the road) lanes at intersections can improve vehicular safety and can enable efficiency gains along the roadway.
Researchers have found that road diets can be expected to reduce overall crash frequency by 19% to 43%, with the higher crash reductions occurring in small urban areas than in metropolitan areas.
A leading proponent of road diets is former Florida Bicycle and Pedestrian Coordinator Dan Burden, who now helms the Walkable and Livable Communities Institute. Burden and Peter Lagerwey published an article on the topic in 1999 noting that in two cases, 95% of residents were initially opposed to roadway constriction. Additional studies have shown that road diets often achieve these positive effects without reducing traffic volumes.
Among studies now showing that there are safety improvements to driving when lane widths are reduced include a recent report by the National Cooperative Highway Research Program (NCHRP) and work analyzing traffic safety for 14 years in all 50 states by Robert B. Noland.
Road diets can negatively affect the speed and reliability of transit service operating on the roadway, particularly if bus stops are located in pullouts and traffic queues delay buses attempting to re-enter traffic. Constructing bus bulbs can mitigate these effects though this feature results in delays for other vehicles.
Not all multi-lane arterials are good candidates for road constriction. Added congestion can outweigh benefits if vehicle traffic volumes exceed the capacity of the three-lane roadway. This threshold is approximately 20,000 vehicles per day. Burden notes additional characteristics of better candidates for vehicle lane removal.
Read more about this topic: Road Diet
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