The frequency and severity of crashes on rural two-lane roadways have increased in the US relative to other road types. This trend can be explained by the growing number of vehicles, higher speeds, narrow shoulders, and vehicle mixes. One solution for improving traffic flow and safety outcomes on rural two-lane roadways is to adopt a 2+1 design, which confers the benefits of four-lane highways but at a lower cost.
Building off of 2+1 guidance originally issued by KYTC in 2013, this report outlines updated policies that account for lessons learned at the agency during the design and construction of 2+1 roadways as well as best practices adopted by other states.
Learn more about 2+1 roadway design.
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