Document Type


Publication Date



Vehicle detectors -- Oregon -- Evaluation, Traffic flow -- Analysis, Traffic estimation, Automatic data collection systems, Oregon Department of Transportation

Physical Description

36 pages, maps


The Oregon Department of Transportation collects data on the performance of the highway system by sampling traffic volume, vehicle classification, truck weights, pavement conditions, etc. The selection of efficient and accurate locations for collecting data is important. This report addresses the larger sampling problem by focusing on locations for collecting truck weight data. Sites selected for weight-in-motion/automatic vehicle identification (WIM/AVI) within the Crescent/HELP project are assessed to determine their locational suitability for truck weight data collection. A method, Representation Optimal Sampling (ROS), to aid in site selection is reported here. Sampling configurations of six and twelve station using ROS are detailed. ROS was applied to the Interstate Highway System and was also demonstrated on the Federal Aid Primary Highway System to show how ROS could be applied to networks with thousands of segments.


A product of the Center for Urban Studies, College of Urban and Public Affairs, Portland State University..

Catalog Number PR026.

Persistent Identifier