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Changes in objective road traffic safety in Łódź in the context of the implementation of an intelligent transport system in the years 2007–2023

Ostrowska Martyna

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej

2025

Nr 95 (tom 2)

77--91

The aim of this article is to present the operation of the Intelligent Transport System (ITS) in Łódź and to analyse its potential impact on changes in objective road traffic safety in urban transport. Data from the years 2007–2023 concerning the number of road accidents, fatalities, and injuries were examined. The research findings indicate a significant decrease in traffic incidents following the implementation of the ITS: the annual average number of accidents has decreased from 1784.67 to 1225.62 (t = 4.07; p = 0.0039), fatalities declined from 38.00 to 18.50 (t = 5.24; p = 0.0003), and the number of injured persons was reduced from 2186.89 to 1464.25 (t = 3.95; p = 0.0044), with very large effect sizes (Cohen’s d > 2.0). Although a downward trend was also observed at the national level, the changes in Łódź were more pronounced and stable. This may suggest a beneficial effect of the ITS as a contributing factor supporting the improvement of objective traffic safety.