Ite Vancourver Nelson Corridors

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Presentation delivred at ITE Annual Meeting, Vancouver, Aug 2010

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  • Thisprepresenation was prepared for and presented at the ITE Annual Meeting, Vancouver, Canada, August 2010.
  • BluFax provides what migtht be called a spacially-oriented approach to the collection of data. The underlying concept is similar to the link-node concept used for
  • Operation Fast Forward was initiated by the District of Columbia following 9-11 to
  • Ite Vancourver Nelson Corridors

    1. 1. Use of Bluetooth-based Data Collection Opportunities and Challenges forUrban Corridor Studies<br />Donna Nelson, PhD<br />Marketing Director, Traffax Inc<br />dcnelson@traffaxinc.com<br />240-447-8612<br />
    2. 2. BluFax Technology<br />Each Bluetooth devices has a unique, but anonymous device ID<br />BluFax devices record:<br />ID of each detectable device.<br />Time stamp ID detected.<br />BluFax unit ID<br />BluFax location coordinates. <br />Distance<br />BluStat Software:<br />Processes station data.<br />Filters and processes data.<br />Outputs graphics and results.<br />User-configurable parameters.<br />Detection Zone<br />At least two units are required! Number of units and spacing depends on application.<br />
    3. 3. Time and Space<br />All BluFax applications build on the concept of comparing the time at which unique device IDs are detected by pairs of units. <br />Segment: Pairs of units<br />Stations-BluFax units <br />A<br />C<br />A<br />B<br />D<br />E<br />H<br />D<br />D<br />G<br />Corridor: Defined by a series of segments<br />O-D Pairs: Defined between pairs of stations to capture Origins & Destinations.<br />
    4. 4. Early Applications…….<br />Early applications focused on vehicle traveltime applications on freeways, arterial roadways, and special events.<br />8/18/2010<br />4<br />I-95 Vehicle Probe Validation<br />Assessment of signal timing on arterials<br />Urban arterials, DC Demo on July 4th<br />Freeway Interchange Assessment<br />Brickyard (Indianapolis) Study<br />Passenger delay at security check points<br />Traveltime studies in Australia<br />
    5. 5. Recent Applications<br />Rapid shift from traveltime to applications requiring a combination of O&D and travel time capabilities.<br />Evolving Application types<br />Application environments<br />Traveltime and delay studies<br />Real-time traveltime information. <br />Signal timing before and after studies.<br />Evaluation of complex interchanges<br />Pedestrian origin-destination studies.<br />Passenger wait times and border wait times. (real time and lane-by-lane)<br />Work zone monitoring (real time)<br />Workzone operations evaluation<br />Access/egress private developments<br />Large-scale planning O-D studies<br />Freeways<br />Arterial roadways<br />High-density urban environments.<br />Workzones<br />Transit stations/pedestrian zones.<br />Intersections<br />Freeway interchanges<br />Access/egress <br />
    6. 6. Key Characteristics<br />The majority of detectable devices are carried by an individual who may be on foot, in an automobile, truck, bus, or the local coffee shop; or vehicles in main lanes and adjacent HOV lanes. <br />Picks ups all signals within its detection zone. <br />Ability to track unique signal past detectors throughout study area.<br />Data from BluFax represents a SAMPLE of the population<br />
    7. 7. 4th of July Demonstration 2009<br />Operation Fast Forward<br />Collect traffic data following special events.<br />Data collection following closure of 4th of July fireworks at the National capital Mall.<br />Develop and evaluate emergency management plans and models.<br />Traditional traffic studies<br />Provide insufficient data to support analysis and modeling needs.<br />Manual data collection for pedestrians labor intensive and expensive.<br />Typical data collection limited to three hours following close of fireworks.<br />
    8. 8. 5 Minute Detection Rates<br />0 to 18<br />0 to 50<br />0 to 80<br />0 to 65<br />
    9. 9. Segment Plot Results by Day<br />Travel time<br />Speed<br />Matched pairs <br />
    10. 10. Un-filtered Traveltimes<br />
    11. 11. Arterial Analysis<br /><ul><li>MD24 in Northern Baltimore
    12. 12. Before/After impact of signal timing
    13. 13. AM, Mid-day, and PM analysis
    14. 14. February 23-27, 2009
    15. 15. New timing on 2/25/09</li></li></ul><li>Intersections and Interchanges<br />Turning movement proportions and travel-time (delay) through interchanges, intersections, and roundabouts are measured by placing BluFax units at each approach. <br />A complex interchange is treated like a small-scale O-D study.<br />All twelve movements for a complex interchange can be captured with as few as four units.<br />The key is to ensure that sample sizes on each segment are sufficient for your study needs.<br />Once units are in place, the additional costs associated with collecting from 1 to 14 days of data are minimal. <br />
    16. 16. Opportunities<br />Corridor data addresses traveltime or speed along defined corridors. <br />Can be defined to reflect different entry/exit points along corridors, or to compare alternate corridors.<br />Provides space mean speed which reflects the time needed to traverse a defined section of roadway. <br />
    17. 17. Origin-Destination Data<br />BluFAX provides origin/destination data with a time element<br />
    18. 18. Volumes and Detection Rates<br />8/18/2010<br />BluFAX does not collect traffic volumes, however, <br />Studies indicate that detection rates track to volumes for comparable time periods.<br />Proportion of turning movements for arterial intersections and interchanges support this…..<br />Detections can be compared to volume counts to establish a baseline for a specific location. <br />15<br />
    19. 19. Bluetooth, Floating Car, Inrix Data<br />
    20. 20. Comparison with ATRs<br />8/18/2010<br />Speed<br />Comparison of BluFAX data with ATR data…..<br />Proportion of volume by time of day<br />17<br />
    21. 21. Pedestrian Station Detections<br />
    22. 22. Date and Time Filters<br />8/18/2010<br /><ul><li>Date_Time filter settings depend on purpose of study.
    23. 23. Segment with the same beginning and end point, and longer time window, provides O-D information for vehicles entering and leaving via the same route.</li></ul>19<br />
    24. 24. Planning or Traffic?<br />The concept can be applied to planning or traffic applications. <br />Often, the same data set and support both types of studies!<br />Filtering criteria<br />Min/max travel times<br />Specific segments (station pairs)<br />Placement of units<br />Density/spacing of units<br />

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