The paper presents the results of the behaviour of drivers in emergency/risk situations caused by a pedestrian entering the driving lane from the right. They were carried out on Kielce Track in Miedziana Gora. 100 drivers were tested in various age groups at different value risk times behind 0,5s 3,0 s. The drivers have the opportunity to perform variant defensive manoeuvres: braking, bypassing or braking with bypassing. The researchers used a specially designed, safe model-up a pedestrian, moving on the path of a car from behind the curtains limiting the visibility of the model. The paper presents and analyses the results of measurements of the reaction times of drivers in a risk time function (mental reaction time, psychomotor reaction time while "braking", motor reaction time when braking psychomotor reaction time). The presented results of drivers reaction time confirm the thesis about the influence the risk time on reaction time. Drivers' reaction times confirm the thesis on the influence of the risk time on reaction times, both when turning and braking and also indicate a trend to shorten reaction times in difficult situations. The research method allowed for the capture of many of these disturbances though the fact of such a capture itself does not mean the possibility of their unambiguous interpretation.