Project Title Research Agency Reporting Period
Quantifying Incident-Induced Delays on Freeways Using Traffic Sensor Data: Phase II TRAC/University of Washington Jan 01, 2009 to Jun 30, 2009
Principal Investigator Agency Budget No. Agmt./Task No.
Wang, Yinhai
206-616-2696 yinhai@u.washington.edu
63-4944 T4118-42
Other Investigator(s) Item No. Funding Source
   
WSDOT Program Manager Start Date Schedule Status
Brodin, D.
360.705.7972 BrodinD@wsdot.wa.gov
2008-09-01 On schedule
Technical Contact Estimated Completion Revised Completion
Legg, B.
206.543.3332 leggb@wsdot.wa.bov
2010-06-30  
FHWA or Other Technical Contact Original Estimated Cost Revised Cost
$75,000.00
Research Area % Funds Expended % Work Completed
Operations 18.19% 20.00%
Objective

· investigate errors in IID estimated by the DQT-based approach by using ground-truth data
· develop a microscopic algorithm for improved estimates of recurrent and non-recurrent delays on freeways
· expand the database developed in Phase I of this study to support broader coverage of freeway incident analysis
· implement the proposed algorithm in a database-driven computer system for automatic IID calculations.

Project Progress

A high-performance computer has been purchased to record live video feeds at both the east rise and west rise monitoring locations of SR-520. The purpose of the video recording is to capture ground-truth data of incidents and their impacts on travel delay on the Evergreen Point bridge. Meanwhile the research team has been working on an improved approach for incident-induced delay calculations. Preliminary results were presented at the Second International Symposium on Freeway and Tollway Operations in June.

The research group had several meetings with traffic operation and data collection experts, including Mr. Doug Brodin, Mr. Matthew Neely, Mr. John Rosen, and Mr. Tony Niemi at the Washington State Department of Transportation (WSDOT), to seek for their input and help on data collection. Since November 2008, the research team has been fetching and archiving 20-second loop detector data from WSDOT. A new database has been designed to manage loop data. The research team is redirecting the Advanced Roadway Incident Analyzer (ARIA) system from a standalone application to map-base online computing.

The research team has completed Tasks 1 and 2, and is currently working on the new incident-induced delay calculation algorithm and its online implementation.

New Period Proposed Activity

In the coming six months, we will focus on incident-induced delay calculation algorithm development and start to implement it in an online computational platform.

Problems

WSDOT resumed its 20-second loop data distribution service since November 2008. However, speed measurements from dual-loop sensors are not available in the data stream. The research team will discuss this issue with the Northwest Region to seek for a solution.
Implementation and Other Relevant Information

None.
Tue Jul 28 16:33:07 -0700 2009