Free public transport, often called fare-free public transit or zero-fare public transport, is public transport which is fully funded by means other than collecting fares from passengers. It may be funded by national, regional or local government through taxation, and/or by commercial sponsorship by businesses. Alternatively, the concept of "free-ness" may take other forms, such as no-fare access via a card which may or may not be paid for in its entirety by the user.

Sonoma–Marin Area Rail Transit (SMART) is a rail line and bicycle-pedestrian pathway project in Sonoma and Marin counties of the U.S. state of California. When completed, the entire system will serve a 70-mile (110 km) corridor between Cloverdale in northern Sonoma County and Larkspur Landing in Marin County. In 2023, the system had a ridership of 749,700, or about 2,700 per weekday as of the fourth quarter of 2023.