Highway Gothic

The Standard Alphabets For Traffic Control Devices, (also known as the FHWA Series fonts and unofficially as Highway Gothic), is a sans-serif typeface developed by the United States Federal Highway Administration (FHWA). The font is used for road signage in the United States and many other countries worldwide. The typefaces are designed to maximize legibility at long sight distances while traveling at road speeds.

The typefaces are defined by the FHWA's Standard Alphabets for Traffic Control Devices, originally published in 1948, and reprinted in 1952. Changes to the specifications were published in 1966, 1977, and 2000. The 2000 specifications differ from earlier versions in the shapes of a few letters and in the inclusion of lowercase letters for all alphabet series. The typeface has seven fonts, from narrow to wider strokes, Series A through F 2000, with a modified version of Series E 2000.

FHWA Series A through F was developed during World War II by the Public Roads Administration (which later became FHWA). Draft versions of these typefaces were used in 1942 for signs on the Pentagon road network. Between 1949 and 1950, as part of a research program into freeway signing carried out by the California Department of Transportation (Caltrans), Series E Modified was developed from Series E by thickening the stroke width to accommodate button reflectors for ground-mounted signs, while a lowercase alphabet was developed to allow mixed-case legend (consisting initially of Series D and lowercase letters) to be used on externally illuminated overhead signs.

The lowercase letters, paired with Series E Modified, later became the basis of a national standard for mixed-case legend on freeway guide signs with the 1958 publication of the American Association of State Highway and Transportation Officials (AASHTO) signing and marking manual for Interstate Highways.

Series A has been officially discontinued in the United States due to poor legibility at high speeds, though it continues to be specified for certain signs in New Zealand. In 2004, the FHWA published lowercase letters for all of the typefaces and made changes to the Manual on Uniform Traffic Control Devices, which allows their use. The first font only included uppercase letters, with the exception of Series E(M), which was used on large expressway and freeway guide signs.

There was an expectation that over the next few decades, the new Clearview typeface, also specifically developed for use on traffic signs, would replace the FHWA series on some new signage. In 2016, the FHWA announced that it was rescinding its 2004 interim approval of Clearview in the United States. While existing Clearview signs could stay up, new signs would have to go back to using Highway Gothic. In June 2016, a bill challenging this decision was introduced in the United States House of Representatives, which would have ordered the FHWA to reinstate the interim approval for Clearview. This bill passed as part of the Consolidated Appropriations Act, 2018. The Federal Highway Administration states "[Clearview] is completely optional and is neither required nor recommended".

An official digital font file of the typeface has never been released. Instead, individuals or companies have developed digital fonts based on the shapes and specifications provided in the standard.

The Roadgeek 2014 font set is an open-source and digital reproduction of the FHWA fonts.