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GIS-Based Support System for On-Demand Flexroute Transit Service

Learn about the prototype GIS-based system for scheduling, routing, and dispatching flexroute transit services. Discover its performance and advantages for transit operations.

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GIS-Based Support System for On-Demand Flexroute Transit Service

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  1. GIS-Based Support System forOn-Demand Flexroute Transit Service Brian Smith Priya Durvasula Stephen Brich Center for Transportation Studies University of Virginia

  2. Presentation Outline • Operations vs. Planning • Flexroute Transit • Flexroute Scheduling & Routing • Prototype GIS-Based System • Performance • Conclusions

  3. State-of-the-Practice • Public transportation planning applications • Ridership forecasting • Route planning • Asset management

  4. Necessary Investments • Hardware and software • Training • Data, Data, Data • 50% - 80% of total cost • Can these investments be used directly to support transit operations?

  5. Flexroute Transit • Small number of fixed stops with predetermined schedule • Provide on-demand service between fixed stops when feasible • Required subsystems • AVL • Communications • Schedule/Dispatch Support System

  6. Service Characteristics

  7. Flexroute Scheduling & Dispatching • Direction of Travel • Inbound/Outbound • Spatial Location of Requests • Relation to Fixed Stops • Temporal Requirements • Feasibility of Service Provision • Manage Committed Rides

  8. GIS-Based Prototype • ESRI’s ArcView • Avenue (55 scripts) • Dialogue Designer • Network Analyst • Transportation Network • TIGER • Data Management • Shapefiles

  9. Pentran -- Agency Partner • Peninsula Transportation District Commission • Hampton, Newport News Virginia • Routes 10 & 11 • Low density • Suburban, semi-urban • Low ridership • Transfer

  10. Modified Routes

  11. Software Development • Functional requirements • Formal design document • Application development • User acceptance testing

  12. System Components

  13. GIS Functionality • Address Geocoding • Use of map interface to fine-tune if necessary (reverse geocoding) • Allows for trip direction to be determined • Analysis of Spatial Relations • Buffers created to determine initial ride eligibility • Overlay operation

  14. GIS Functionality (ctd) • Network Analysis • Shortest path problem with time window constraints • Shortest path between fixed stops servicing each committed on-demand stop • If adding a new trip violates time constraints, trip is not allowed • Use of map interface to search for feasible alternatives

  15. System Demonstration

  16. Performance • 4 minutes, on average, required to schedule a trip • Includes “customer interaction” time • Pentium-class PC • Desktop GIS functionality adequately supports requirements.

  17. Conclusion • GIS can and should be used as a tool in transit operations. • Significant advantages • reuse of data • training • avoid closed, proprietary solutions • Pentran is pursuing a trial implementation of flexroute service

  18. Buffer/Overlay

  19. Input Dialog Box

  20. Output Dialog Box

  21. Direction of Travel

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