Clive D. W. Feather wrote:

In article , Colin
McKenzie writes

But I'm not sure there's any actual UK evidence that trams attract
more people out of cars than trolleybuses - how would you obtain it?

Again, IIRC, when Tramlink opened the shopping centre in Croydon saw
something like a 30% increase in visitors with a *decrease* in parking.

Yes, granted - but we don't know what would have happened with a
trolleybus scheme - it might have been even better. Unfortunately for
science, I can't see a tram and trolleybus route being introduced
simultaneously in comparable locations to allow the direct comparison.

You could always promote trolleybuses as trackless trams.

Colin McKenzie