This document is Volume II of the final report on precursor systems analyses of the Automated Highway System (AHS). It summarizes the research results in the Automated Check-in activity area. Situations in AHS where transition from manual to automated control takes place are analyzed. In particular, vehicle fitness testing to ensure safe and smooth automated operation has been emphasized. The check-in procedures presented here and an effective malfunction management system, together with a reliable control system, would ensure a safe, smoothly operating AHS system. It is concluded that on-board built-in diagnostic tests are practical for sensor testing since crucial sensor tests can be performed via consistency checks on the redundant paths; on-board built-in tests of control actuators and electronics are also practical, provided the systems are designed for testability. This requires certain non-standard design modifications for the brake, throttle, and steering systems that allow on-board built-in diagnostic testing of automatic control electronics and actuators during manual operation. Provided that such testable control system designs are adopted, no on-site tests are expected to be needed. Whenever a malfunction is determined in any redundant path, fall-back procedures to the next lower level of automation not requiring that particular redundancy will have to be initiated.

  • Corporate Authors:

    Raytheon Company

    Missile Systems Division, 50 Apple Hill Drive
    Tewksbury, MA  United States  01876

    University of Southern California, Los Angeles

    Center for Advanced Transportation Technologies
    Los Angeles, CA  United States  90089

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Turan, L
    • Ioannou, P
    • Safonov, M G
    • Smith, D
    • Damos, D
  • Publication Date: 1995-4


  • English

Media Info

  • Pagination: 87 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00722544
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: Resource Materials, FHWA-RD-95-093
  • Contract Numbers: DTFH61-93-C-00196
  • Files: TRIS, USDOT
  • Created Date: Jun 14 1996 12:00AM