International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

This paper examines the technical validity of motorcycles and mopeds registered in the Republic of Croatia as a factor of road safety, analysing data from the Centre for Vehicles of Croatia (CVH) for the period 2023–2025. The study focuses on three dimensions: the age structure of the registered L category vehicle fleet, aggregate periodic technical inspection (PTI) defect data for all L category vehicles in 2025, and disaggregated inspection outcomes for L1 (mopeds) and L3 (motorcycles) subcategories. Results indicate that the Croatian PTW fleet is structurally aged, with over 57% of vehicles exceeding ten years of age in 2025. The overall PTI failure rate stands at 8,28%, with mopeds recording a substantially higher rate of 10,79% compared to 6,73% for motorcycles. The most prevalent defect categories are lighting and signalling devices (32,64%) and tires and suspension (25,15%). The findings highlight the need for strengthened PTI enforcement and targeted public awareness campaigns.

In the paper, various approaches to measuring and documenting traffic accident investigations were analysed: traditional measuring wheels and modern motion sensor – based measuring devices. The research showed that motion sensor – based measuring devices, specifically “Moasure One Pro” device, provide significant advantages in precision, speed and efficiency in conducting investigations compared to traditional measuring wheels. The time required to conduct the investigation was significantly shorter with the motion sensor – based measuring devices, while data transfer to software applications such as “AutoCAD” and “PC – Crash” was almost instantaneous. In conclusion, the introduction of advanced technologies into everyday practice can significantly improve the quality and efficiency of traffic accident investigations.