Road Diet Informational Guide¶
Federal Highway Administration. (2014). Road Diet Informational Guide.
Cited by¶
2 citations across 2 artifacts.
Each citation links to the sentence it supports in the citing article.
Domain-specific¶
- Complete Streets
- The textbook Complete Streets treatment is the "road diet," the four-to-three lane conversion the FHWA lists as a Proven Safety Countermeasure
This sourceFHWA's Road Diet Informational Guide defines the classic road diet as the four-lane-to-three-lane conversion with a centre two-way left-turn lane and records FHWA's designation of road diets as a Proven Safety Countermeasure. FHWA's synthesis of before-after evaluations reports total crash reductions of 19 to 47 percent for four-to-three lane conversions, the low end from California and Washington suburban sites and the high end from small-town Iowa; the guide lists turning-conflict, pedestrian-exposure and speed mechanisms without ranking them.
SupportedVerified against the source
- The textbook Complete Streets treatment is the "road diet," the four-to-three lane conversion the FHWA lists as a Proven Safety Countermeasure
- Road Diet
- Eliminating the ambiguous left-turn movement — drivers in the outer lane attempting to turn left across through traffic — removes the conflict point that generates a disproportionate share of crashes on undivided four-lane roads; the Federal Highway Administration's road-diet evaluation found crash reductions of 19 to 47 percent in studied corridors
This sourceThe FHWA guide reporting road-diet crash reductions in the 19 to 47 percent range across the corridor studies it summarises. The roughly 20,000 ADT figure the guide uses to screen candidate corridors, and the conditional feasibility judgment behind it. The FHWA crash-reduction range together with the guide's attribution of most of the safety gain to eliminating the outer-lane left-turn-across-traffic conflict. The documented effect sizes the FHWA evaluations attach to the standard four-to-three-lane cross-section. The 19 to 47 percent crash-reduction range FHWA reports for four-to-three-lane conversions.
- Eliminating the ambiguous left-turn movement — drivers in the outer lane attempting to turn left across through traffic — removes the conflict point that generates a disproportionate share of crashes on undivided four-lane roads; the Federal Highway Administration's road-diet evaluation found crash reductions of 19 to 47 percent in studied corridors
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