mutcd (10. 409)

Via Kottke, we are referred to Jon Keegan’s survey, contributor for Beautiful Public Data, of the US Federal Highway Administration’s style guide for American road-markings. With particular emphasis of uniform, the Manual on Uniform Traffic Control Devices for Streets and Highways sets forth the national standards for all signage open to public travel, with exacting specifications for font (Highway Gothic), size, kerning, backgrounds, etc to ensure swift recognition and legibility.