This time last year, the Safe Road Trains for the Environment (SARTRE) program hit a milestone. Using a specially equipped Volvo S60 with a big-rig taking the lead, the EU-funded researchers managed to create the world’s first fully-functional road train, allowing the driver in the sedan to sit back and enjoy the ride without touching the controls.

Today, Volvo – the program’s only automotive partner – has announced that the SARTRE program is in its final phase of testing, and that includes adding a few more vehicles to the rolling procession of autonomous cars.