THE USE OF PSYCHOPHYSIOLOGY TO ASSESS DRIVER STATUS

Twenty subjects completed an on-the-road driving experiment, consistin g of two different tests conducted on two separate days. A two-part te st was administered while subjects were under the influence of alcohol (BAC < = 0.05%); a four-part test was administered without alcohol co nsisting of a 2.5 h driving test under vigilance conditions on a quiet highway. The order of the tests was balanced across subjects. Changes in relevant physiological parameters, such as ECG and EEG, reflected changes in driver status and predicted driving impairment. Impairment of driving performance was measured in a standard driving test (SD lat eral position and SD steering wheel movements) and in a recently devel oped car-following test (reaction to speed changes of a leading car).