Croydon traffic has declined by 1/5 since the tram was introduced, 25% of passengers have switched from car to tram

Croydon

Although publicly promoted and funded tramways in the UK have not always given good value for money, other countries manage it, and we might learn from them, as indeed
did the Tramlink in Croydon, which was privately funded and promoted, and subsequently purchased by TfL. It carries 35m passengers pa, over 25% of whom have left a car at home. Traffic in Croydon has declined by a fifth since opening in 2000, whereas in the rest of London it has increased.