A professional driver took the lead of the convoy in a truck, and was followed by four self-driven Volvo vehicles: a second truck and three cars, Volvo said in a statement.
Vehicles in the road train were equipped with safety systems including cameras, radar and laser sensors, enabling them to monitor the lead vehicle and other vehicles on the road, Volvo said.
“By adding in wireless communication, the vehicles in the platoon mimic the lead vehicle using Ricardo autonomous control – accelerating, braking and turning in exactly the same way as the leader,” it said.
The cars successfully drove for 200 kilometers (124 miles) on May 22 along a motorway outside Spain’s northeastern city of Barcelona, a Volvo spokesman said.
Volvo Car Corporation’s project manager, Linda Wahlstrom, was filmed driving one of the cars in the convoy as the system instructed her to lift her feet from the pedals and then remove her hands from the wheel.