Road Diet Conversions: A Synthesis of Safety Research

Source: Pedestrian and Bicycle Information Center (PBIC)

The primary purpose of this review is to assess the available evidence regarding the safety effectiveness of reductions in the number of motorized traffic lanes, widely known as road diet conversions. Although road diets have been implemented since at least the 1970s, earlier reviews and a search of the literature identified no controlled safety evaluation studies conducted prior to the year 2002. A systematic search of literature dating from 2002 was conducted. Six studies in total were initially identified, with four serving as the basis for most conclusions in this review.

Road diets are one of the nine Proven Safety Countermeasures being promoted by the Federal Highway Administration's Office of Safety. For more information, visit

Back to Search Results