**Ivan Smajla, Daria Karasalihovi´c Sedlar \*, Branko Drljaˇca and Lucija Juki´c**

Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10 000 Zagreb, Croatia; ivan.smajla@rgn.hr (I.S.); branko27493@gmail.com (B.D.); lucija.jukic@rgn.hr (L.J.) **\*** Correspondence: daria.karasalihovic-sedlar@rgn.hr; Tel.: +385-1-5535-829

Received: 27 December 2018; Accepted: 2 February 2019; Published: 6 February 2019

**Abstract:** Liquefied natural gas (LNG) use as a fuel in road and maritime traffic has increased rapidly, and it is slowly entering railroad traffic as well. The trend was pushed by the state administrations of mainly EU countries and international organizations seeing LNG as a cost-effective and environmentally friendly alternative to diesel. Different infrastructural projects for the widespread use of LNG in transport have been launched around the world. The main goal of this paper was to analyze use of LNG as a fuel for heavy trucks. Different aspects of LNG chain were analyzed along with economical and ecological benefits of LNG application. Filling stations network for LNG were described for the purpose of comparative analysis of diesel and LNG heavy trucks. Conclusion has shown that using LNG as propellant fuel has numerous advantages over the use of conventional fuels. The higher initial investment of the LNG road vehicles could be amortized in their lifetime use, and in the long-term they are more affordable than the classic diesel vehicles. In addition to cost-effectiveness, LNG road vehicles reduce CO2 emissions. Therefore, the environmental goals in transport, not only of the member states but worldwide, could not be met without LNG in heavy truck traffic.

**Keywords:** heavy truck traffic; road transport; liquefied natural gas (LNG); alternative fuels
