AbstractThe article presents the results of research on the total reaction time of drivers in real traffic conditions. The tested driver had to react to a complex signal by performing a braking manoeuvre. The measurements were based on the author’s method combining the measurements of reaction time during the actual driving with their computer analysis. The research group consisted of 15 drivers with different seniority of driving licences. The study measured the time of perception and the time of leg transfer from the accelerator pedal to the brake pedal. The results were subjected to analysis and on its basis conclusions were formulated.

The article presents the results of simulations using the finite element method (FEM) aimed at examining the extent of damage to the wheel rim as a result of hitting an obstacle. The obtained results can be used as comparative data during the performance of expert opinions to give an answer as to how the damage occurred. The data obtained from the FEM simulation can also be used in the process of geometric optimization of the rim, which aims to obtain a rim resistant to this type of damage.

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This article describes the impact of limiting human mobility related to the COVID-19 pandemic on the level of air pollution related to transport. The city of Krakow and the emission level of nitrogen oxides (NOx) were used as a case study. This article describes the air quality monitoring system in Krakow and the measurement results from the measurement station at Krasinskiego Avenue. The average values of the pollution level in April 2018–2020 were compared. For the selected range of data, a significance test was performed, which resulted in no grounds for rejecting the hypothesis of the equality of the mean levels of nitrogen oxides concentrations in the spring. The analysis takes into account the average monthly temperatures in the discussed years.

Presented was the procedure of reconstructing a motorcycle-motor car collision with both vehicles moving in the same direction and performing simultaneous manoeuvres: a left turn and overtaking. Because of the conflicting reports of witnesses, the procedure also involved recordings from a stationary video camera. These data allowed us to retrace the movement and manoeuvres of vehicles as a function of time and then to identity the perpetrator of the accident.