## 1 Introduction
In many studies, detailed results regarding the impact of vibrations on humans are presented without proper context, which complicates the drawing of general conclusions. Furthermore, there is often a lack of information about the source of the vibrations, which is crucial for understanding the mechanisms of their action and potential impact on people. This is a significant oversight, as the source of vibrations is fundamentally important for their characteristics. For example, vibrations caused by vehicles moving on railroads are characterized by greater intensity and are therefore more perceptible to people in buildings than vibrations caused by vehicles on roadways. This difference in perception and impact on people stems from differences in transport technology, the type of substrate, and the construction of infrastructure supporting various types of transport. Considering the passive reception of transportation-type vibrations by people in buildings and the not entirely comprehensive methodology of assessing the impact of vibrations on people, it has been observed that the existing methodology associated with the RMS (Root Mean Square) method may be insufficient in certain cases. In the recorded signal originating from transportation sources, so-called peaks can occur, for example, when there are irregularities on the road or track, and these peaks are more perceptible than the stable passage of a vehicle near a building. Therefore, in many national and international standards, an auxiliary measure called the Vibration Dose Value (VDV) has been introduced to assess the impact of vibrations on people in buildings. The Vibration Dose Value, by incorporating the fourth power in its formula, does not lose these peaks but, in fact, makes them more prominent in the signal. The aspect that unites all methods of assessing the impact of vibrations on people in buildings is the reference of analysis results to the posture of a person present in a room. In assessing the impact of vibrations on people, three positions of human vibration reception are considered. In the sitting and standing positions, a person receives vibrations through the feet or the seating surface, in such a way that the \"z\" axis, which runs along the spine, is the vertical axis, while the \"x\" axis (back to front) and \"y\" axis (side to side) are horizontal axes. In the lying position, the entire body surface receives vibrations in such a way that the \"z\" axis becomes the horizontal direction, and the \"x\" axis becomes vertical. The perception of vibrations by humans varies depending on the direction of their action in such a way that for frequenciesbelow 4 Hz, horizontal vibrations are more perceptible than vertical ones, while above this frequency, the situation is reversed, and it is the vertical vibrations that are more perceptible. Information about the purpose of the room, the time of occurrence of the vibrations, and their nature are included in the value of the correction factor \"n\" in the RMS method, which should be used to multiply the vibration perception threshold curves to obtain curves representing the comfort assurance lines in a given measurement situation. In VDV, they are included in the value itself in the table. The article presents the results of 24 h measurements conducted during the construction of the metro line in Warsaw. The analysis of the results was carried out using both the classical RMS method and the VDV method. Interesting events related to the passage of metro trains, tram cars, and automobile traffic on a nearby road were recorded.