It's been awhile since we saw Volvo's SARTRE (Safe Road Trains for the Environment) project, which was last running out of harm's way on a test track near Gothenburg. Volvo has just taken a big step forward in fostering confidence by conducting its road train on public asphalt. The 124-mile Spanish test both proved that the cars could stay driverless without posing a threat and upped the ante for what the cars could do: the lead truck, an S60, a V60 and an XC60 all moved
