An NTUA Diploma Thesis called “Free Public Transport in Attica Region” was recently presented by Vaggelis Goulas. This Diploma Thesis revealed that the possibility of changing means of free public transport depends largely on the cost, time, comfort, beliefs, transportation characteristics and demographic characteristics of the respondents. The faster and more comfortable the journey, regardless of cost reduction, the more likely it is to opt for free public transport instead of staying in the existing means of transport.