The estimation of up-to-date origin-destination matrix (ODM) from an obsolete trip data, using current
available information is essential in transportation planning, traffic management and operations.
Researchers from last 2 decades have explored various methods of estimating ODM using traffic count
data. There are two categories of ODM; static and dynamic ODM. This paper presents studies on both the
issues of static and dynamic ODM estimation, the reliability measures of the estimated matrix and also
the issue of determining the set of traffic link count stations required to acquire maximum information to
estimate a reliable matrix.
