I wonder if the tram is partly the reason why many bus routes in Croydon have been removed.I agree that for every full car there are many with only the driver in. One thing to factor in is those journeys with fewer people in are often shorter. Certainly shorter than the family of four going on holiday.
But it is sad to see in Croydon the rise of the out of town shopping with all its car parks. Also we have had bus routes replaced by cycle lanes thus forcing the bus stops to be further from the town centre. Something I did not expect is the almost total lack of cycles using those cycle lanes !. We have also had most bus shelters removed during 2022 (I am puzzled by this). It just shows a lack of appreciation of public transport by the council and at a time when public transport is vulnerable.