daily capping

Transport for London, that city's regional transit operator and planning agency, has had a "daily cap" on bus, tram, and train fares since 2005. The fare system stops charging pay-as-you-go riders for trips once they spend a certain amount, which depends on which services you use and zones you visit. This means that you'll never spend more on transit in one day than a daily pass would have cost (sometimes even less), which gives everyone the value of a day pass without making people buy those passes in advance.