"Roland Perry" wrote in message
...
In message , at 13:11:03 on Sat, 17 Sep 2016,
tim... remarked:
It would be a nightmare of weaving cars as people who wanted to/didn't
want to pay cash realised they were in the wrong lane

None of this was a problem when the choice was Dart-tag or cash.

that's because there were no special lanes for dart tag

you just drove though a normal booth and the barrier opened without you
paying

You could do that today using ANPR for those regular users with an
account.

1) you'd still need the barrier so that it could remain closed until the
cash payer had paid the correct amount (and in the completely idiot proof
system - received their change)

No physical barrier required, just traffic lights.

but that will still result in a queue


2) how do you determine which punters in the queue are going to post pay
by internet?

By concluding that all those who didn't pay, and didn't have a prepay
account, must be post-pay. Exactly the same as today (apart from the
cash/card payers).

It's not exactly the same as today, as today you don't have to control a
little red/green light for people to proceed

tim