Press Room

National VII Architecture – Data Perspective

Michael Schagrin
ITS Joint Program Office
Research and Innovative Technology Administration
TRB 2008 Annual Meeting Session 415
January 16, 2008

Powerpoint Version

Outline

National Architecture Overview

• Data Within VII Infrastructure
• Applications Enabling Services
• Proof of Concept Applications
• Issues Relevant to Use of VII Data
  

VII Vision

• Linking vehicles and the transportation infrastructure into an integrated, nationwide system has been a vision of the U.S. Department of Transportation (USDOT) for almost two decades.
• VII technologies, network and services are designed to support applications facilitating three major goals: Safety,Mobility and E-Commerce
  

VII National Architecture Framework

• Wireless communications uniquely tailored for vehicular environment
• Secure communications between service providers and vehicles
• Architecture designed around DSRC, however extendable to other wireless communications technologies
• Data collection / message distribution functions common to many applications are provided as core services… enabling rapid applications development
  

VII Enables Collection, Distribution and Exchange of Data

Vehicle to Infrastructure

• Probe Data
• Trip Path Data (opt-in)
• Transaction Data (e.g., E-Payment)

Infrastructure to Vehicle

• Advisory Message Data
• Localized Map Data (safety)
• Signal Phase & Timing Data
• Position Corrections
• Transaction Data (e.g., E-Payment)

Vehicle to Vehicle

• Heartbeat Data
  

VII Enabling Services − Probe Data Distribution

• This service collects probe data from vehicles and distributes to interested users (e.g., Traffic Management Centers, Information Service Providers)
• Provides real time data to enable determination of roadway conditions
• Probe Data includes vehicle position, speed, direction of travel and vehicle kinematics data, etc. (SAE J2735)
• Applications that utilize Probe Data include Traveler Information, Signal Timing Optimization, Winter Maintenance, and Road Weather Prediction
• User applications “subscribe” to receive specific types of probe data from specific locations
• Vehicles generate probe data periodically and in response to significant events, “publishing” this data when in range of an RSE
• Probe data is delivered to applications with matching subscription criteria
• VII does not provide a data repository for probe data, it merely transports the data
• Could provide for integrated delivery from other probe data sources
  

VII Enabling Services − Advisory Message Delivery

• This service distributes localized advisory messages such as travel times, incident information, local signage
• Helps drivers make safety and travel decisions based on localized advisories
• Data types include Signal Phase & Timing (SPAT), Local Signage, Local and Regional Weather Alerts
• Applications that utilize advisory messages include Intersection Collision Avoidance, Traveler Information, In-Vehicle Signage
• Provider specifies broadcast locations & delivery schedule
• Safety messages receive broadcast priority
  

VII Enabling Services − Map Element Distribution

• This service provides roadway micro-maps to vehicles
• Micro-maps are used to support safety applications such as intersection collision avoidance and curve overspeed warning
• Data includes detailed roadway geometry for signalized intersections, non-signalized intersections, road curve segments
• System utilizes anonymous probe data to verify map accuracy and to detect potential events

VII Enabling Services − Heartbeat

• This service is frequent transmission of vehicle speed and location to other vehicles
• It enables situational awareness for vehicles
• Data contains vehicle’s position, speed, direction of travel, and size
• Supports safety applications such as lane changes, forward collision warning, emergency electronic braking
  

VII Enabling Service − Data Exchange Transport

• This service supports exchange of opt-in bi-directional transactions between vehicles and service providers
• It enables an endless variety of public and private applications, where direct communications between service providers and vehicles is needed
• Data could include vehicle diagnostics information, emissions inspection data, and e-payment transactions
• Applications could include concierge services, vehicle maintenance, and tolling
• Vehicle is always the initiator of any transaction, Service Provider and vehicle can then exchange data
  

Summary of Proof-of-Concept Applications

Public

• Traveler Information
• Signal Timing Optimization
• Ramp Metering
• Weather Information
• Corridor Management: Planning Assistance
• Corridor Management: Load Balancing

Private

• In-Vehicle Signage
• Off-Board Navigation
• Parking Payment
• Toll Payment

Safety

• Vehicle-to-Vehicle
• Intersection Violation Warning
  

Issues Relevant to Use of VII Data

Absolute and Relative Positioning

• Applications such as intersection collision avoidance and HOT lane tolling require highly accurate (lane-level) vehicle positioning and availability of detailed roadway geometric maps
  

Data Ownership and Liability

• Lingering questions of data ownership and rights have the potential to limit the usability of the data
• Liability associated with VII data ownership must be defined for every entity involved in the system

Updated August 20, 2008 10:23 AM