The article presents a proposition of a methodology of research performed to assess car drivers’ perception at level crossings. Its main assumptions as well as the description of devices and tools selected for carrying out the research were given. The steps of the proposed methodology algorithm are discussed in detail. The background of the issue presents the conditions of the functioning of railway crossings in Poland. The last part of the article are the final remarks, in which the areas of application of results obtained according to the proposed methodology are indicated.

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Functional resonance is a novel approach of explaining how adverse events happen in complex socio-technical systems. It stresses the fact that such systems in most of the cases function without any negative consequences due to their internal adaptiveness, called resilience. Therefore, this approach is particularly suitable to domains with relatively high level of safety, where there is not much data on incidents and accidents form the past. It can also be used for describing other analyses domains in order to better understand their resilience mechanisms. The literature review performed with help of Scopus database shows clearly that the topic of functional resonance is getting more and more attention in the scientific world. The research aiming to develop the FRAM or using it as a tool for various kinds of safety analyses is being published in the best journals from a variety of disciplines, especially the Engineering. Transportation system was the domain of the research in four investigated papers; three times the aviation transport and once – maritime transport. There was no publication in the urban transportation, although the FRAM is applicable also in this domain.

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The transport system from the safety point of view consists of: technical objects, operators and human resources, operation safety subsystems, and system management center. In the area of these subsystems, there may be hazardous sources of external or internal character. Based on the analysis of transport systems, it is concluded that man causes numerous mistakes. The baggage control system and the persons responsible for the functioning of this system have a significant impact on airports' safety level. Dia-grams of multi-stage processes for checking hand luggage and checked baggage has been developed. Eighty-two flights departing from the airport, in which over 1500 passengers were checked-in, were observed to indicate gaps in procedures during baggage processing. They sent over 7500 luggage items in total. During the observation, passengers were asked whether they carried objects defined as hazardous in their hand luggage or checked baggage, and then the affirmative answers obtained were counted. During the check-in, passengers of all analyzed flights, while answering the "safety questions", declared 281 items, which we defined as hazardous. The study confirmed the hypothesis that the transport of dangerous objects in the wrong luggage type has not yet been eliminated and is a hazard source in air transport. Groups of travelers were indicated by a constant lack of awareness about the materials not permitted for air transport.