4Th International Conference on Smart Cities and Green Ict Systems / 1St International Conference on Vehicle Technology and Intelligent Transport Systems (Vehits), Date: MAY 20-22, 2015, Location: Lisbon, PORTUGAL, Sponsors: Inst Syst & Technol Informat Control & Communicat, IEEE Power & Energy Soc, Assoc Comp Machinery SIGCAS, IEEE Tech Area Green Comp, IEEE Technical Sub Comm Green Communicat & Comp, Friends Supergrid, Network Sustainable Ultrascale Comp, Lisbon City Council, INTELI, Lisboa E Nova, Turismo Lisboa, CEIIA