Conversions: 1 mi/h 1.609 km/h, 1 ft 0.305 m.
Note: For design criteria pertaining to collectors and local roads wih ADT less
than 400, please refer to the AASHTO publication, Guidelines for Geometric
Design of Very Low-Volume Local Roads (ADT ≤ 400).
Source: Location and Design Manual, Vol. 1, Roadway Design, Ohio
Department of Transportation, with permission.