Time signals recorded by the on-board diagnostic system (OBD), describing the manner of vehicle’s movement in actual road
conditions show non-stationarity and non-linearity, as well as statistical multiscalarity. In practice, it means that the analysis of
registered time series requires modelling of non-linear phenomena. The aim of this study was to examine the nature of the vehicle
speed profile in actual road conditions with the method of multifractal analysis. A number of studies indicates that the driving tests
applied for many years have not been representative for the actual operating conditions of vehicles. For both the new Worldwide
Harmonised Light duty Test Cycle (WLTC), a worldwide harmonised procedure of light vehicle testing, as well as in actual urban
driving conditions along the measuring route, being subject to empirical research, confirmation of strong multifractal properties
of the recorded vehicle speed time series have been obtained.
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