Introduction
With the need to develop transportation facilities to meet
increasing travel demand around the World, many urban land
transportation studies are conducted each year. These range
from master planning for road and public transit networks to
implementation of traffic control and management measures.
Decisions on a substantial amount of investment in the
transportation infrastructure are made on the basis of findings
from such studies. This has led to a proliferation of models
and software packages for use in conducting these studies.
Concurrently, there has been a substantial amount of research
work carried out by academics and researchers in the
transportation field, attempting to obtain solutions to
transportation and traffic problems. This has resulted in an
explosion of papers proposing various models and algorithms
published in journals and conference proceedings.
In this paper, some of the pitfalls in urban transportation studies
and research are discussed. Only two areas, demand
forecasting and traffic assignment, are covered here due to
space constraints.

Authors:

Henry S. L. Fan (chenryf@ntu.edu.sg)

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