Attentional demand as a measure of the influence of visibility conditions on driving task difficulty. Paper presented at the 51st Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1972.

This paper describes an experiment in which drivers wearing goggles with various density filters were required to negotiate a slalom course. Varying vehicle speed and goggle filter density, the researchers measured attentional demand. They conclude that attentional demand provides a measure of control task difficulty or operator skill to which more conventional measures may be insensitive.