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									Successful Multilane Express Lane Tolling
 A Short Case Study Focusing on AVC and AVI Systems

                     Matt Milligan
               North Texas Tollway Authority

                      Andy Lees
              Diamond Consulting Services




               IBTTA Technology Workshop
                 June 2004     Miami, FL
Overview
•NTTA and the RITE Project
  •The RITE Solution
  •Solving multilane tolling challenges
•RITE Lane Controller
  •High-level requirements
  •Payment mechanism
  •Vehicle sensing and classification
•Vehicle Processing
  •In the direction of travel
  •Laterally
•Challenges and Solutions
The RITE Solution
Regional Integrated Toll Enhancements
 •Project began in 1999
 •Suite of toll collection applications
 •Distinct system modules
    •Customer Service Center
    •Violation Processing Center
    •Audit & Reconciliation Host
    •Facility Server
    •Lane Controller
RITE Lane Controller
 High-level Requirements
    •Support industry-leading toll equipment
    •Allow real-time control and monitoring
    •Process high-speed, high-volume traffic
    •Support adjacent express AVI lanes (3+)
    •Provide hardware redundancy
RITE Lane Controller (cont.)
 Payment Mechanism
   •TransCore AI1200 Reader with passive tag
      •One Reader & antenna per lane
      •No RF attenuation -- ensure maximum
      pattern
      •Readers are “always on” to eliminate
      latency
RITE Lane Controller (cont.)
 Vehicle Sensing & Classification
   •Idris™ multilane tolling unit
       •“Smart Loops” that track vehicle signatures
       •Directional and lateral vehicle processing
       •Discreet loop outputs provide redundancy
       •Configurable violation trigger
Vehicle Processing
 Directional Processing
 • Simultaneous monitoring in adjacent lanes
 • Stages
    1. Vehicle detection
    2. Payment
    3. Progression through the lane
    4. Vehicle exit
 Lateral Processing
 • Vehicle zone mapping
 • Two levels of AVC operation
 • Critical to tag association and violation capture
Multilane Multi-loop Layout
Straddling Vehicles
Tracking Lane Changes
What Idris™ Provides
• Axle based AVC
  – Other class schemes are supported from axle and
    profile information, e.g. Buses, Dual tires
• Vehicle tracking from AVI read to VES trigger
• AVI tag association
• Accurate VES trigger
  – Multiple lateral lane positions available
• Complete road coverage in tolling zone
Accuracies in Open Road
• Separation and tracking
   – 99.99% free flow
   – Better than 99% in full congestion
• Classification
   – 99.8% typically in any traffic mix
Challenges & Solutions
 Transaction-related challenges
    1. Tracking vehicles laterally
    2. Matching vehicles to payments
    3. Identifying and processing violations
 Solutions
    1. Idris™ locates and monitors vehicle position
    2. RITE Lane Controller analyzes AVC and AVI
       data to match vehicles to tags
    3. Idris™ provides vehicle trigger for VES
Challenges & Solutions
 System-related challenges
   1. Mitigating software & hardware failures
   2. Minimizing maintenance
   3. Ensuring accuracy
 Solutions
   1. Exploiting hardware and system
       redundancies
   2. Real-time monitoring and hardened systems
   3. Extensive testing and periodic audits
Where Idris™ fits…
• Idris is a component of a system
• Aim to reduce risk, implementation cost, life cost
• Delivery is flexible to reflect that
   – Separate box
   – Integrated on lane controller
• Multiple sources
   – Detectors
   – Integrators
   – Product suppliers
Future Steps
 •Integration of Idris™ software into RITE Lane
 Controller
 •New developments in TransCore’s technology
 •More system diagnostics and real-time reporting
 •Incremental accuracy improvements
 •Further coordination with integrators and vendors
   Thank You

      Matt Milligan
North Texas Tollway Authority


       Andy Lees
Diamond Consulting Services

								
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