| ETG’s
AVL system solution integrates both transponder and GPS/GPRS technologies
into a single package. As the system evolved through a city wide implementation,
Brisbane Transport has recognised that the ideal HOV system is a combination
of technologies rather than any specific core technology. This involved
the use of GPS and now GPRS radio communications for servicing outer areas
where there was less opportunity to receive data through traffic lights
and the use of transponder technology on inner roads where congestion is
a significant factor in determining journey time. This has been a clever
initiative as it inherently recognised that journey time predictability
was related to both the frequency of sampling the position of the HOV vs
traffic volume induced congestion while minimising ongoing operational costs
associated with use of radio communication from HOVs.
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