In message , at 21:39:44 on Fri, 20
Jan 2012, " remarked:
By the way, the only place outside the US that E-ZPass works is on the
Peace bridge across the Niagara river, where the toll booths happen to
be on the Canadian side. In Toronto, the 407 toll road uses the same
technology as E-ZPass but for some reason does not interoperate with it.

Why can't they just introduce one single smart card for the area, the
way they have in London? And there is compatibility between different
operating agencies as Oystercards are accepted not only on TfL modes of
transport, but also on National Rail in Greater London.

That's easier if there are a finite number of players (eg TfL and half a
dozen "Network Southeast area" National Rail companies). Scaling it to
numerous authorities operating independent bridges could be a problem.
Imagine a different operator was charging tolls for every road bridge
from Tower Bridge to Windsor.
--
Roland Perry