Abstract. The influence of vibration on human body is an issue that from several decades is a subject of many research and experiments. But most of these research concern on negative influences on human body. The paper presents methodology and results of research conducted on bus drivers of National Urban Transport in Tychy. The study involved fourteen drivers. First stage of the experiment included biomechanical and medical tests. After that psychological tests were made determining such factors like personality characteristics and stress resistance. Second stage included monitoring of psychomotor condition of drivers during night and day shifts, before and after work.

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Abstract. At the workplace of the machine operator, low frequency whole body and hand-arm vibrations are observed. They occur together with noise. Whole body vibration in the range of 3-25 Hz are detrimental to the human body due to the location of the resonant frequency of large organs of the human body in this range. It can be assumed that for this reason people working every day in such conditions can have reduced working efficiency. The influence of low frequency vibration and noise on the human body leads to both physiological and functional changes. The result of the impact of noise and vibration stimuli depends largely on the specific characteristics of the objects, which include among other personality traits, temperament and emotional factor. The pilot study conducted in the laboratory was attended by 30 young men. The aim of the study was to look for correlations between the need for stimulation of the objects and their psychomotor efficiency in case of vibration exposure and vibration together with noise exposure in variable conditions task. The need for stimulation of the objects as defined in the study is based on theoretical assumptions of one dimensional model of temperament developed by Marvin Zuckerman. This theory defines the need for stimulation as the search for different, new, complex and intense sensations, as well as the willingness to take risks. The aim of research was to verify if from four factors such as: the search for adventure and horror, sensation seeking, disinhibition and susceptibility to boredom, we can choose the ones that in conjunction with varying operating conditions, may significantly determine the efficiency of the task situation. The objects performed the test evaluation of their motor skills which consisted in keeping the cursor controlled by a joystick through the path. The number of exceeds of the cursor beyond the path and its maximum deviation was recorded. The collected data were used to determine the correlation between the working efficiency and the need for stimulation of the objects under the influence of vibroacoustic factors. The analysis of the results allowed to define a set of criteria that make up the arduous working conditions. The obtained results indicate the need for the continuation of the research.

New expectations in the field of psychotechnical tests and screening of transport operators has led to the improvement of theoretical foundations and increase in quality of the psychological judicature, which has proved to be challenging to the scientific units and health centers. The purpose of the abovementioned adjudicating is to determine the existence or the absence of the contraindications to drive a vehicle or to perform the duties of an instructor or an examiner. This is particularly difficult in case of the branch of unit based transport (that is road transport) where the results of the emergencies are usually incomparably lesser than in others means of transport (air, rail, sea). These tests have been presented only from the perspective of professional transport operators and their range is limited. The publication contains the description of a new methodology of testing transport operators with the use of a device that allows to determine the level of functional efficiency of the nervous system and the correlation of mental processes (such as the efficiency of cognitive, intellectual, and psychomotor functions and selected personality features, temperament) with the physiological parameters (pulse, GRS etc.) – that is Psychotronics. This device allows to diagnose the psychomotor efficiency of people employed in professions requiring special psychomotor vigilance and human activity where current psychological possibilities determine the life and safety of others.