Robert L. Bertini

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With the growing availability of data because of the deployment of intelligent transportation systems, methods for assessing and reporting traffic characteristics and conditions have begun to shift. Although previous level-of-service methods were developed for use with limited data, actual performance measures can now be developed and tested. On freeways,(More)
Travel time estimation is of increasing importance to travelers and transportation professionals alike as congestion worsens in major urban areas. In fact, the reliability of travel time estimates on a given corridor may be more important for travelers, shippers, and transport managers than the travel time itself. This paper examines the uses of measured(More)
In this paper a new method for real time estimation of vehicular flows and densities on motorways is proposed. This method is based on fusing traffic counts with mobile phone counts. The procedure used for the estimation of traffic flow parameters is based on the hypothesis that ‘‘instrumented’’ vehicles can be counted on specific motorway sections and(More)
To address increasing traffic congestion and its associated consequences, traffic managers are turning to intelligent transportation management. The <i>latte</i> project is extending data stream technology to handle queries that combine live streams with large data archives, motivated by needs in the Intelligent Transportation Systems (ITS) domain. In(More)
A System-Wide Adaptive Ramp Metering (SWARM) system is being implemented in the Portland metropolitan area, replacing the previous pre-timed ramp-metering system. SWARM has been deployed on six major corridors and operates during the morning and afternoon peak hours. This study entails a ―before‖ and ―after‖ evaluation of the benefit of the new SWARM system(More)
The objective of this paper is to conduct a country specific analysis of freeway traffic oscillations. Toward this end, loop detector data from sites in the United States, Germany and the United Kingdom was analyzed. By using a method applied in previous work, traffic oscillations were identified in all three countries. Calculation of the cross–correlation(More)
Currently, many municipalities offer information about current conditions on local freeway facilities via the Internet or some other media. However, as important as freeways may be for many travelers, it is clearly desirable to collect and disseminate traveler information about arterials since nearly forty percent of the nation’s vehicle miles traveled(More)
With the availability of this rich source of archived data, new analytical tools can be developed for use with historical data and in a real-time environment informed by past performance. The objective of this paper is to describe the techniques used for rigorous validation and refinement of an automated system to identify freeway bottlenecks within the(More)