The GDS fonts, including GDS Transport, are licensed under the Open Government Licence. This allows for a wide range of uses, including commercial projects. Always check the current licence terms for any specific conditions or updates.
Maximized legibility for users under various conditions, originally tested for drivers at high speeds. gds transport typeface download
If you are looking for the font used on the UK government websites (often referred to as the "GDS font"): The GDS fonts, including GDS Transport, are licensed