Validation and augmentation of Inrix arterial travel time data using independent sources.

PDFTech ReportMD-15-SHA-UM-3-6SP309B4FTravel timeData fusionArterial highwaysGlobal Positioning SystemBluetooth technologyValidationMarylandMaryland. State Highway AdministrationHaghani, AliZhang, XuechiHamedi, MasoudUniversity of Maryland (College Park, Md.). Dept. of Civil and Environmental EngineeringUS Transportation CollectionTravel time data is a key input to Intelligent Transportation Systems (ITS) applications. Advancement in vehicletracking and identification technologies and proliferation of location-aware and connected devices has made network-wide travel time data available to transportation management agencies. The trend started with data collection onfreeways has been quickly extended to arterials. Although freeway travel time data has been validated extensively inrecent years, the quality of arterial travel time data is not well known. This project presents a comprehensive validationscheme for arterial travel time data based on GPS probe and Bluetooth generated data as two independent sources.Since travel time on arterials is subject to a higher degree of variation compared to freeways mainly due to presence ofsignals, a new validation methodology based on coefficient of variation was introduced. Moreover, a ContextDependent (CD) based travel time fusion framework was developed to improve the reliability of travel timeinformation by fusing data from multiple sources. The entire 2012 data on a busy arterial corridor consisting of sixsegments in Maryland was used to demonstrate the proposed comparison and augmentation model