Dynamic Estimators of Origin-Destination Matrices Using Traffic Counts

Transportation Science - Tập 27 Số 4 - Trang 363-373 - 1993
Ennio Cascetta1, Domenico Inaudi2, Gérald Marquis2
1Department of Transportation Engineering, University of Naples, Naples, Italy 80127
2Centro Studi sui Sistemi di Trasporto, Turin, Italy 10123

Tóm tắt

This paper proposes different “dynamic” estimators using time-varying traffic counts to obtain (discrete) time-varying OD flows or average OD flows. All the estimators can combine counts with other available information, e.g., out-dated matrices and surveys, on a general network and can be formulated as optimization problems. In the case of time-varying OD flows, two types of estimators are proposed. Simultaneous estimators produce joint estimates of the whole set of OD matrices, one for each time slice, whereas sequential estimators produce a sequence of OD estimates for successive time slices. A particular type of simultaneous and sequential estimator (namely Generalized Least Squares) was tested on the Italian Brescia–Padua motorway for which “true” OD flows over a whole day were available. Results were generally satisfactory, showing that also in the “no a priori information” case significant estimates could be obtained.

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