Data are presented on the ability of drivers to perceive and scale the relative velocity between their own and a lead vehicle. Experiments were carried out on four groups of subjects using Ekman's ratio-rating method. Only when the subtended angular velocity of the lead vehicle exceeded about 0.003 rad/s were the subjects able to scale the relative velocity. The threshold subtended angular velocity obtained in the experiments was very much affected by the ability of subjects to use the concept of a ratio - engineering students found this a simpler task than did the subjects from the general population. The result of this was that the values used by the engineering students were closer to the real values. The relative velocity was perceived non-linearly, with a Stevens' power law exponent of about 0.8. It was found that linear models gave as good a fit to the data.

  • Availability:
  • Corporate Authors:


    The Boulevard, Langford Lane
    Kidlington, Oxford  United Kingdom  OX5 1GB
  • Authors:
    • Hoffmann, E R
    • Mortimer, R G
  • Publication Date: 1996-7


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00726195
  • Record Type: Publication
  • Report/Paper Numbers: HS-042 373
  • Files: HSL, TRIS, ATRI
  • Created Date: Sep 18 1996 12:00AM