Distraction of the driver's attention is one of the key aspects of research conducted by automotive companies. It concerns not only onboard devices, but also the factors outside the vehicle, such as advertising displays. Too much attention focused on advertisements can have negative impact on the driver's behaviour and driving quality. The 2-second distraction can more than double the risk of an accident. The paper presents the results of a simulator-based study, in which 60 drivers (including

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... 0 women) age-18-64 take part. All participants had a valid driving license and differed in their driving experience. It has been verified how the time of focusing the attention on the roadside advertisements affects the given safety and driving performance indicators.