Second-Generation UMTRI Coding Scheme for Classifying Driver Tasks in Distraction Studies and Application to the ACAS FOT Video Clips

This report describes the development of a new coding scheme to classify potentially distracting secondary tasks performed while driving, such as eating and using a cell phone. Compared with prior schemes (Stutts et al., first-generation UMTRI scheme), the new scheme has more distinctive endpoints for tasks and subtasks, is less subjective (e.g., no “high involvement” eating), includes codes for activities absent from prior schemes (e.g., chewing gum), and more closely links subtasks to visual, auditory, cognitive, and psychomotor task demands. The scheme has codes for 12 tasks (use a cell phone, eat/drink, smoke, chew gum, chew tobacco, groom, read, write, type, use an in-car system, internal distraction, and converse) plus codes for drowsiness. The scheme takes several factors into account, such as where the driver is looking, where the driver’s head is pointed, what the driver’s hands are doing, the weather, and the road surface condition. Each main task was divided into 3 to 17 subtasks (e.g., groom using tool, reach and get phone). This scheme was used to code video clips of drivers’ faces from the ACAS field operational test. In the first pass, 2,914 video clips were coded (for task, drowsiness, weather, and road) using custom UMTRI software. In the second pass, a sample of 403 distracted and 416 nondistracted clips were coded frame by frame (15,965 frames) for the subtasks performed, gaze direction, and where the head was pointed.

  • Record URL:
  • Supplemental Notes:
    • Title on Technical Report Documentation Page is: Second-Generation UMTRI Coding Scheme for Classifying Driver Activities in Distraction Studies and Application to the ACAS FOT Video Clips.
  • Corporate Authors:

    University of Michigan Transportation Research Institute

    2901 Baxter Road
    Ann Arbor, MI  United States  48109-2150

    Delphi Delco Electronics Systems

    One Corporate Center, M/C E110, P.O. Box 9005
    Kokomo, IN  United States  46904-9005
  • Authors:
    • Yee, Serge
    • Green, Paul
    • Nguyen, Lan
    • Schweitzer, Jason
    • Oberholtzer, Jessica
  • Publication Date: 2006-7


  • English

Media Info

  • Media Type: Web
  • Features: Appendices; Figures; References; Tables;
  • Pagination: 61p

Subject/Index Terms

Filing Info

  • Accession Number: 01149512
  • Record Type: Publication
  • Report/Paper Numbers: UMTRI-2006-16
  • Contract Numbers: DRDA 04-4274
  • Files: TRIS
  • Created Date: Jan 21 2010 2:51PM