John M. Ishimaru

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This report documents the technical results of a WSDOT-sponsored research effort to determine the nature and cause of congestion on Seattle-area freeways based on an analysis of available databases of traffic incidents and freeway performance. The focus of this effort was to develop a methodology for estimating freeway congestion as a function of its(More)
The contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Washington State Transportation Commission , Department of Transportation, or the Federal Highway Administration. This report does not(More)
The TRACFLOW software processes induction loop data to develop performance metrics for freeways in the Seattle area. The loop data are sometimes subject to errors. To find and correct errors, the TRACFLOW system uses a three-step approach to detect and address variations in the quality of the traffic data. Each step can include data replacement if(More)
This report documents the results of five Advanced Traveler Information System (ATIS) project evaluations performed for the Washington State Department of Transportation. The projects encompassed a range of devices in both urban and rural environments. Guidelines and lessons learned for planning and operating ATIS programs were then developed from the(More)
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