"Roland Perry" wrote in message
...
In message , at 10:29:43 on Mon, 5 Nov
2012, tim..... remarked:
Especially if they continue to make it free between 22:00 and 06:00. How
will someone know if they have snuck into the free period and thus don't
have to phone up to pay, or just missed it by a couple of seconds and do?

They could send that hat round for an illuminated sign informing road
users of the situation.

There's still the possibility of the sign changing the instant that you pass
it.

tim