Road hotspot warning system based cooperative concept


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This presentation describe a Intelligent Transport System designed for developing traffic safety at road hotspot.

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Road hotspot warning system based cooperative concept

  1. 1. Road Hotspot Warning System Based on Cooperative Concept Hao YE Nottingham Geospatial Institute University of Nottingham
  2. 2. Research Motivation Every year millions of accidents occurred on the roads, particularly on road hotspots where there are higher accident risk than other sections of road. Existing hotspot notification techniques are often static and predefined, which are relatively unreliable because they cannot consider a range of accident contributory factors together, for example, those factors referred to human, vehicle, road and environment. Source: Traffic England & Highway Code
  3. 3. Research Approach This project was to create a cooperative concept based hotspot warning system platform which integrates a range of archived and real-time data sources together in order to support drivers with better advice and reliable warning for potential dangers. The other application of this system is to provide data collection of real-time traffic data stream at road hotspots for transport monitoring and management Application Server v Road Hotspot Risk Level: highest risk! Time of Period: winter, 7-9 pm Primary Causation: turn too fast Traffic Condition: congested road Weather Condition: rainy Recommendation: reduce speed Internet Databases
  4. 4. Research Objectives • To provide a comprehensive review of current cooperative concept based systems, including existing applications, techniques and potential challenges; • To identify system requirements of a cooperative hotspot warning system, and design system architecture to perform the required functions; • To use GIS-based techniques for analysing historical accident hotspots areas, and integrate analysis results onto road digital hotspot maps; • To design, develop and establish a system prototype platform based on the designed system architecture; • To prove the feasibility of system design concept by demonstrating the prototype platform at selected case study areas, and evaluate the performance of the prototype with field experiments under realistic traffic conditions;
  5. 5. System Architecture Data Analysis Layer Data Exchange Layer Information Dissemination GIS platform Physical Devices Layer GNSS Historical Accidents Cellular Network On-Board Unit Integrated Traffic Database Data Package Accident Hotspots Group Vehicles
  6. 6. Prototype System Design GNSS In-vehicle Sensors CAN-Bus On-Board Unit State Estimator Data Manager Human Machine Interface Wireless Communication Message Encoder Information Display Module Drivers Client Vehicle Cellular Network Infrastructure Application Server Wireless Communication Hotspot Algorithm Digital Hotspot Map Other Database Message Encoder Data Manager Control Platform Transport Operator
  7. 7. Precise Positioning Module Lane-Level Hotspot (~3m) Road-Level Hotspot ( > 10 m) Road Site Hotspot (1~2m) y v x Standard Lane 3.65m Road Boundary • Road-level hotspots: much larger than general road width e.g. school zones, construction zones, intersections, and roundabouts. • Lane-level hotspots: small hazardous areas close to lane width e.g. emergent curves, high-risk sites on road lane, lane entry points • Site-based hotspots: microscopic, hazardous or temporary areas on the road, e.g. road work sites, icy sites, potholes, temporary road work sites, etc.
  8. 8. Digital Hotspot Map Module Drivers Human-Machine Interface User-Centric OBU platform Map Database Map Integration Analyse road hotspots Extract road hotspots • Digital Hotspot Maps were created by using geospatial techniques to analyse historical accident database in GIS and integrating to system platform
  9. 9. Communication Module Internet (TCP/IP) Internet (TCP/IP) Internet (TCP/IP) Socket Socket Socket Program Program Program Internet Program Socket Internet (TCP/IP) Client Vehicles Application Server • Communication is based on 3G cellular communication as it can provide longdistance communication range, higher data rate, lower delay and cost. • This module was built on end-to-end TCP/IP protocol which means each vehicle can connect to the server by a unique IP address, the implementation is based o nTCP sockets for reliability purpose • The main function is to support real-time hotspot warning, as well as bi-directional data exchanand updating ge, such as hotspot map updating and traffic data collection
  10. 10. Hotspot Warning Algorithm The algorithm includes a hotspot proximity part and an intelligent warning part. The hotspot proximity part mainly uses GIS method to check entry/exist status of vehicle, while the intelligent warning part adopts a range of simulated real-time data to demonstrate the feasibility of hotspot warning. Message input Dangerous time period No Hotspot Proximity Yes No Yes Extensive Monitoring Dense traffic flow No Yes No Acquire hotspot attribute Yes • Time • Traffic • Weather Yes No Bad weather Yes No Vehicle Status Yes Yes • Speed • Acc • Heading Yes hotspot warning
  11. 11. Messaging Mechanism Basic Safety Message (BSM) Roadside Hotspot Message (RHM) Extensive Safety Message (ESM) V Client Vehicle Hotspot Boundary BSM ESM Message ID Message ID Message Type Time Stamp Position Velocity Message Type Time Stamp Position CAN-BUS Turn Light Rain Sensor Brake RHM Message ID Message Type Time Stamp AccType Message Check Velocity Light Sensor AccNum ∙∙∙∙ Advise Message Check Other Sensor Message Check
  12. 12. Prototype Implementation Client GUI Application Server GUI • The prototype demonstrators were developed based on Windows platform by programming in C#. The current system platform includes the functions such as GNSS data acquisition, GIS hotspot integration, vehicle tracking, reliable wireless communication, hotspot algorithm decision making and bi-directional data exchanges.
  13. 13. Field Experiment (c) Client Platform NGI (a) Application Server (d) Video Data Recorder A-Road Minor Roads Intersections (b) Testing Van Experiment Route Experiment Installation
  14. 14. Performance Evaluation Entering Hotspot Leaving Hotspot Hotspot Area Client Application Server
  15. 15. Thanks for your attention!