electric vehicles, internal combustion engines, environmental friendliness, electric buses, electric trucks, economic feasibility, batteries, costs, entrepreneurship, management decision, feasibility of operating electric vehicles
electric buses, electric car, innovative modular method of battery release and replacement, unification, international transportation, accumulatory batteries, efficiency of electric transportation, disposal, energy
ecology,electric vehicles, hydrogen vehicles, internal combustion engine (ICE), clean
public transport, air pollution, electric buses, clean energy sources
