Safe Road Trains for the Environment were testing at the proving grounds of Volvo, a Swedish manufacturing company headquartered in Gothenburg.
Test track trials of SARTRE platooning took place at the Volvo Proving Ground near Gothenburg, Sweden and in a public road in Spain. Safe Road Trains for the Environment (SARTRE) is a European Commission-funded project to investigate and trial technologies and strategies for the safe platooning of road vehicles, a transportation concept in which several vehicles are electronically linked together in a "road train", with only the lead driver in active control. 
