PT - JOURNAL ARTICLE AU - Drahotský, I. AU - Peltrám, A. TI - Limits of Environmentally Friendly Transport DP - 2009 Jun 1 TA - Transactions on Transport Sciences PG - 36--41 VI - 2 IP - 2 AID - 10.5507/tots.2009.007 IS - AB - For railway transport to be more environmentally friendly than road transport it is necessary to reach more than the minimum occupancy and load in passenger trafficking and in freight trafficking respectively. It is not of great use to compare average values, e.g., of consumption of energy and emissions of elements of greenhouse gases; a better option is to compare the consumption of fuel per passenger and the same in the case of emissions. When comparing two vehicles of the same or comparable modes of transport (buses, railway units) in local and regional passenger traffic we can describe, with an acceptable simplification, the point of intersection of two lines of both consumption and emissions.