On Thu, 13 Oct 2005 11:02:04 +0100, "J. Chisholm"
wrote:

Bristol had an earlier abortive system with Lasers on buses and
bar-codes on Lamp posts. Unfortunately Lasers shook themselves to pieces
and buses had to be out of service for repair as no 'modular ' construction.

Hamburg used to have (may still do) a system based on infra-red remote
control, whereby the bus would send out a signal to identify itself to
the bus stop flag, which would also have a transceiver in it. Nice
idea, but reliability was awful, especially when the buses and/or
flags got mucky.

These days, GPS technology is so cheap it's almost not worth
considering anything else.

Neil

--
Neil Williams in Milton Keynes, UK
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