The article substantiates the influence of the planning style of activity on the reliability of the driver's activity. The work includes the description of the process of creating and approving the questionnaire "Individual style of driver's activity". The questionnaire contains questions assessing the means used by the driver to carry out activities (in particular, referring to the preservation of information on the road environment, schemes for organizing traffic on a particular route). Data on the reliability of the questionnaire (internal consistency and retest) are presented. The procedure for estimating the compensating effect of the planning style of the driver's activity on the reliability of the activity with a low speed of switching of attention is described. Compensation effect was determined by the ratio of the level of compliance with the requirements of the activity for the speed of switching of attention and the formation of a planning style of activity. The reliability of the drivers' activity was evaluated by a group of experts by recording the number and type of accidents involving drivers. The correlation between the reliability of the driver during life and during the last year was investigated. A higher level of reliability of driving activity is determined by a combination of a higher social status of the driver, with its greater connection with the transport sector, a more mature age, a more markedly planned style of activity, and a higher level of reliability of activities throughout life.