CVISN Roadside Electronic Screening

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CVISN Roadside Electronic Screening
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Definitions

• Screening
• A selection mechanism to make efficient use of
  limited fixed weigh station and inspection
  resources
• Electronic Screening
• Application of technology to the screening
  process to make an informed decision whether
  further examination of a vehicle is required
• Results in improved station traffic flow, focused
  vehicle inspections, increased compliance

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Standardization of Data Exchange

• Dedicated Short Range Communications (DSRC)
• Vehicle-to-roadside RF communications
• ASTM E17.51 and IEEE P1455 standards
• Electronic Data Interchange (EDI)
• Computer-to-computer data exchange
• TS 285, 286, 997
• Data Snapshots
• State-to-national systems exchange
• Quick picture of safety history and credentials

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Roadside Systems

• Screening System
• Screening decision
• Screening messages
• Roadside Operations System
• Interface to CVIEW and other information systems
• Station operator interface
• Traffic flow and control
• Sensor Driver Communications System
• Vehicle measures
• Driver signalling

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Roadside Components

• DSRC Readers
• Weigh In Motion (WIM)
• Automatic Vehicle Classification (AVC)
• Vehicle Tracking Loops
• Automatic Signing
• License Plate Readers
• Roadside Operations Computer
• Screening Computer

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Roadside DSRC Equipment

• Reader Functions
• Advance Identify carrier and vehicle
• Clearance Transmit bypass/pull-in decision
• Ramp or scale Identify vehicle on ramp WIM or
  static scale
• Compliance Detect illegal bypass
• Exit Clear pull-in flag Write event data

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Fixed Site Mainline WIM Configuration
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Screening Algorithm Components

• Tag Validation
• Weight and Size Screening
• Safety Screening
• Based on carrier safety history derived from
  snapshots
• Credentials Screening
• Based on credential violations or history
  information contained in snapshots
• Random Selection Factor

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Deployment Issues

• DSRC standards currently under development
• ASTM 17.51 Physical and data link layer
  (hardware)
• IEEE P1455 Application layer (Message sets)
• Interoperability issues being addressed by
  various groups
• ITS America CVO Policy Committee
• American Association of State and Highway
  Transportation Officials (AASHTO)