The methods of evaluating drivers' steering ability from their steering maneuver during driving are presented. The characteristic values in these methods are time lag in steering and lateral displacement of cars, which are estimated by changes of drivers' steering maneuver. Noticing the fluctuations of the values under various conditions, the degree of drivers steering ability is also estimated at real time by Fuzzy-algorithmic approach, with the criterion made by the drivers' steering behavior. Low levels of concentration of drivers are evaluated by the degree of their steering ability. The evaluated values are found to coincide with the reduction in drivers' fatigue and physical data, and these methods prove effective in evaluating drivers' conditions.
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