🚀 go-pugleaf

In message <QjMAq.59906$3Y.27027@newsfe18.ams2>, Jethro 
<krazykara0@googlemail.com> writes
>On Sat, 26 Nov 2011 21:47:55 +0000, Ian Jackson wrote:
>
>> In message <faqdnRkurYT9JE3TnZ2dnUVZ7oKdnZ2d@brightview.co.uk>, Nick
>> Finnigan <nix@genie.co.uk> writes
>>>On 25/11/2011 13:25, Zimmy wrote:
>>>>
>>>> Then I got to thinking; the Parking Warden must look up the car on his
>>>> portable computer as there is no ticket to stick on the windscreen
>>>> when you pay by mobile. Therefore, there's no real reason why said
>>>> portable computer can't also alert said Parking Warden to mobile-paid
>>>> parking times about to expire, to ensure timely ticketing before the
>>>> felon returns.
>>>
>>> Anything pre-pay could contact a central location and then alert the
>>>PW when a ticket is about to expire - might have a partial reg in some
>>>cases. Or the PW could note times in his PC as he proceeds around the
>>>parking areas.
>>>
>>>> Maybe paying by mobile is not quite so handy after all or am I just a
>>>> cynic?
>>>
>>> ... or not sufficiently paranoid.
>>
>> Of course, the system could work as follows: 1. 'Phone in' at start of
>> parking period. 2. 'Phone in' again at end of parking period. 3. Get
>> charged for time spent parking. Or is this just TOOOOO easy?
>
>But many schemes have a limit ... "max 2hrs, no return within the hour".

How would that invalidate such a system? Phone in - start the clock. 
Phone in again - stop the clock. You pay for what you use. If you stay 
for longer than two hours, you get a penalty in addition to your parking 
time. If you tried to re-start the clock, you would not be able to until 
the end of the 'no return' time. Or is there another problem?
-- 
Ian