Presentation is loading. Please wait.

Presentation is loading. Please wait.

1 Traffic Performance Measurement Using High-Resolution Data – The SMART-SIGNAL System Dr. Henry Liu Department of Civil Engineering University of Minnesota.

Similar presentations


Presentation on theme: "1 Traffic Performance Measurement Using High-Resolution Data – The SMART-SIGNAL System Dr. Henry Liu Department of Civil Engineering University of Minnesota."— Presentation transcript:

1 1 Traffic Performance Measurement Using High-Resolution Data – The SMART-SIGNAL System Dr. Henry Liu Department of Civil Engineering University of Minnesota Twin Cities March 1, 2011

2 2 An automatic and continuous data collection system from existing traffic signals A performance measurement system for intersection queue length and arterial travel time, especially under congested traffic conditions A performance tuning system for optimization of traffic signal parameters

3 3 SMART-SIGNAL System Architecture DetectorsSignal Local Data Collection Unit Data Server at Master Cabinet... FIELD DetectorsSignal Local Data Collection Unit DetectorsSignal Local Data Collection Unit TMC Database Preprocessed Data Performance Measures DSL Communication Road Travelers Traffic Engineers USERS MonitorDiagnosisFine-tuningTravel Decision Direct/Internet Access Internet Access

4 4 Terminal Box DAC Data Collection

5 5 SDLC Serial Port #1 Serial Port #2 Power Ethernet Plug-and-Play Device for TS2 Cabinet

6 6

7 7 11 intersections on France Ave. in Bloomington (March 07 – June 09) 6 intersections on TH55 in Golden Valley (Feb. 08 – Sept. 09) 3 intersections on PCD in Eden Prairie (Current) 6 intersections in the City of Pasadena, California (Iteris, Spring 2011, On-going) 14 intersections on TH13 (Spring 2011, Expected) 10 intersections on TH55 (Spring 2011, Expected) SMART-Signal Implementation Sites

8 8 Prairie Center Dr. and Technology Dr. (Eden Prairie) Feb 4, 2010

9 9 Queue length estimation – Delay, Level of Services, number of stops Identification of oversaturated conditions – Oversaturation Severity Index (OSI) Travel time estimation – Personal trip delay, number of stops, carbon footprint on travel Developed Algorithms

10 10 Vehicle classification / speed estimation – Both arterial and freeway applications Queue length / travel time prediction – Modeling of Arterial Traffic Flow Fine-tuning signal timing parameters – Offsets, Green Splits, Break Points for time of day … Algorithms Under Development

11 11 Lessons Learned from SMART-SIGNAL Although traffic is traditionally modeled as continuous flow, traffic, after all, is discrete. Measuring traffic flow parameters using the data collected at the individual vehicle level Dont aggregate data before useful information being derived Technological advances support such data collection at affordable prices

12 12 Publications Liu, H. and Ma, W., (2009) A virtual vehicle probe model for time-dependent travel time estimation on signalized arterials, Transp. Res. Part C, 17(1), Liu, H., Wu, X., Ma, W., and Hu, H., (2009) Real-Time queue length estimation for congested signalized intersections, Transp. Res. Part C, 17(4), Wu, X., Liu, H. and Gettman, D. (2010) Identification of Oversaturated Intersections Using High-Resolution Traffic Signal Data, Transp. Res. Part C, 18(4), Wu, X., Liu, H, and Geroliminis, N. (2010) An Empirical Analysis on the Arterial Fundamental Diagram, Transp. Res. Part B, 45,

13 13 Acknowledgements

14 14 THANK YOU! Dr. Henry Liu SMART-Signal Web Site:


Download ppt "1 Traffic Performance Measurement Using High-Resolution Data – The SMART-SIGNAL System Dr. Henry Liu Department of Civil Engineering University of Minnesota."

Similar presentations


Ads by Google