The purpose of the article is to analyse and assess the factors affecting the sense of security in public passenger transport on the example of the capital city of Warsaw. The factors were defined on the basis of the standard "PN-EN 13816: 2004 Transport. Logistics and services. Public passenger transport. Definitions, goals and measurements regarding the quality of services" and data collected by the Municipal Transport Authority in Warsaw. A survey was conducted on this basis, the results of which were used to model the level of the sense of security using artificial neural networks (ANN).? ANN, among many criteria, enabled the assessment of the key factors having impact on the level of the sense of security.