Free alternatives to Interstate
Interstate (Font Bureau): Interstate, designed by Tobias Frere-Jones in the 1990s, refines the FHWA Highway Gothic lettering of American road signs into a complete type family. Its angled stroke endings and high legibility gave it a huge run in broadcast graphics, sports, and corporate identity.
Interstate is a commercial Font Bureau family licensed per style through Type Network and resellers, with dozens of widths and weights priced individually.
Overpass, commissioned by Red Hat, is drawn directly from the same Highway Gothic signage alphabets Interstate is based on. Same source material, open license, making it the most honest free substitute.
Barlow is another signage-derived grotesque, modeled on California public lettering. It shares Interstate's utilitarian roots and comes with condensed companions for tight layouts.
Roboto Condensed handles the compressed information-display role Interstate Condensed plays in broadcast and dashboards, with a more neutral character.
Archivo Narrow is a practical narrow grotesque for labels, tables, and captions where Interstate's condensed cuts would be used.
Oswald is a loose match: a condensed gothic rather than a signage face, but it delivers similar punch in sports-style headlines where Interstate Bold Condensed is common.
Interstate is a trademark of its owner and is not distributed by DaFontFonts. This page recommends independent open-licence typefaces with a comparable feel; they are not copies and render with their own metrics and details.
Questions
Is Interstate free because it is based on highway signs?
No. The underlying FHWA alphabets are a US government standard, but Interstate itself is Frere-Jones's copyrighted interpretation and requires a commercial license.
What free font is based on the same road signage as Interstate?
Overpass. It was developed from the Highway Gothic signage alphabets under an open license, so it shares Interstate's DNA and is free for commercial use.