Abstract
A driver's inability to detect small headway changes and small relative velocities is a primary reason for his poor car- following performances. This can be greatly improved if be is given information-headway and relative velocity-concerning the state of a lead car. This may be provided visually, tactually, or audibly. In the study reported, control stick with a built-in kinaesthetic tactile display was tested in a car-following situation. Performances with this display were compared to those obtained when no aiding was used in a similar situation. Sizable reductions in velocity variance and headway variance was obtained for the aided care relative to the unaided case.