On Wed, 30 Jul 2008 11:05:15 +0100, "John Rowland"
 wrote:

>Roland Perry wrote:
>> In message
>> ,
>> at 01:36:45 on Wed, 30 Jul 2008, thagor2008@googlemail.com remarked:
>>> Just have some bleeper which gets more and more urgent and if the
>>> computer thinks the bus is going to strike the bridge then it slams
>>> on the breaks. The technology exists to do it.
>>
>> "just" Hmm... Given that many bridges have very little clearance under
>> them, how will this device tell from sufficiently far away whether the
>> bridge is six inches too low, or six inches higher than required?
>
>Because it has a GPS and a gazetteer of low bridges?

iBus does *exactly* that.... So we should see an end to this sort of
thing in London.

Richard.