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CVISN Roadside Electronic Screening

CVISN Roadside Electronic Screening. Electronic Screening uses technology to make informed pull-in/bypass decisions. Definitions. Screening: A selection mechanism to make efficient use of limited fixed weigh station and inspection resources Electronic Screening:

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CVISN Roadside Electronic Screening

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  1. CVISN Roadside Electronic Screening

  2. Electronic Screening uses technology to make informed pull-in/bypass decisions 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

  3. Standardization of interfaces is a critical component of the CVISN architecture 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

  4. Functions distributed between three roadside systems 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

  5. Various components are combined according to site requirements and goals 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

  6. Multiple DSRC readers are necessary to perform different functions 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

  7. AVC WIM AVC AVC DSRC Compliance Reader DSRC Advance Reader DSRC Clearance Reader DSRC Scale Reader DSRC Exit Reader Static Scale Inspection Area Configuration may vary based on site requirements and layout Fixed Site Mainline WIM Configuration

  8. Failure of any single screening component results in pull-in condition 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

  9. Multiple deployment issues exist; including immature DSRC standards and interoperability concerns 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)

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