Page 33 - TT Aug-Sept pdf for digital

ITS

multiple real-world timesteps at a the economic benefits of the
time. Mesoscopic models provide proposed scheme are or how
enough detail for assessment of much improvement in travel time
traffic management measures is the scheme likely to achieve. However, such models
while still being applicable Their outputs can also be fed are under utilised for
to large scale networks. Sub- into 3-D visualisation and Virtual a number of reasons
microscopic models on the other Reality (VR) models that provide ranging from lack of
hand may involve a more detailed qualitative inputs to aid decision technical expertise, lack
representation of vehicle dynamics making for high-level stakeholders. of manpower, lack of
such as engine RPM with respect The models can also be applied to
to speed and more representative evaluate schemes that are planned awareness about model
simulation of vehicle dynamics. to be implemented in the short to availability and lack
Transport models can be used medium term. Traffic Impact Analysis of institutional culture
in a wide range of contexts. studies for new developments fall into in making data driven
Traditionally, macroscopic this category. A detailed simulation decisions to name a few.
transport models have been used analysis of complex ITS schemes are
to aid long term transport planning. often carried out before they are
A calibrated and validated model implemented to validate the technical
updated with predicted future
transport demand is combined
with planned road network
enhancements to determine the
impact of such planned schemes.
The output data of a transport
model can be fed into various
other tools to assess pollution
dissipation, air quality and climate
change as road traffic is responsible
for a large share of carbon
emissions and other pollutants.
Traffic volumes computed by
transportation models can also be
fed into noise emission models.
Thus, these models help to
quantitatively evaluate transport
schemes before they are built.
They help decision makers
answer questions such as what

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