American Society of Civil Engineers

The IEM Model for Estimating Origin-Destination Matrices from Traffic Counts

by Lei Zhao, (School of Business and Economy, East China University of Science and technology, Shanghai, China 200237; E-mail:

pp. 4440-4445, (doi:

     Access full text
     Purchase Subscription
     Permissions for Reuse  

Document type: Conference Proceeding Paper
Part of: Logistics: The Emerging Frontiers of Transportation and Development in China
Abstract: Origin-destination (OD) matrices are the essential data in traffic planning and management activities, and many estimating models and methods were proposed. The Entropy Maximizing (EM) model is the main approach to solving the OD estimating problems, but it has the difficulty in determining the link choice proportion and the inconsistency in observed link traffic counts still exists. To overcome these shortcomings of the EM model, the maximum likelihood estimate method and the improved EM (named IEM) model are proposed. The methods needn’t estimate the link choice proportion and include a pretreatment of link traffic volumes so that the inconsistency in observed link traffic counts can be eliminated.

ASCE Subject Headings:
Matrices (mathematics)
Traffic management
Traffic models