[chrisa]

This doesn't sound like the same study, but it's similar: a TED talk about how adding a fee for bridges in Stockholm reduced the number of cars by 20% and effectively eliminated congestion: http://www.ted.com/talks/jonas_eliasson_how_to_solve_traffic...

[SilasX]

"Yeah, so, it turns out that charging for something prevents its overuse."

'WOW! REALLY?'

[sirsar]

I think the point is the nonlinearity of speed as a function of the number of cars, i.e.,

"Charging for something reduced use by 20%, and overuse-related problems by 95%"

"WOW! Why don't more people do that?"