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We have developed
a wide-area traffic simulator NETSTREAM (NETwork
Simulator for TRaffic Efficiency And Mobility) for
predicting the introductory effects of ITS for reducing
traffic congestion, pollution reduction, and preliminary
evaluation of traffic measures. In the early NETSTREAM
I, in order to calculate a wide-area traffic flow
at high speed, the block density method was used.
In this model, the vehicleÕs movement was calculated
by a fluid approximation of the traffic flow. Using
NETSTREAM I, prediction of traffic congestion reduction
by the traffic information system was performed,
and the change in traffic conditions to a guided
vehicle rate was estimated. Moreover, prediction
of traffic conditions at the time of the Nagano
Olympic Games in 1998 was performed. This contributed
to an examination of traffic measures such as traffic
restriction and signal control by the National Police
Agency and the Nagano Prefectural Police. Since
then, NETSTREAM II has been developed. It uses a
traffic flow model that is capable of calculating
each vehicle's movement as is required for ITS introduction.
Using NETSTREAM II, prediction of traffic conditions
at the time of some public events in Toyota-city
was performed, and it was utilized for an examination
of a scheme for a shuttle bus service for the park-and-bus-ride
system. From now on, NETSTREAM will be applied to
the prediction of real-time traffic conditions as
required for dynamic route guidance, and to the
prediction of traffic flow as required for improvement
of air quality.
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