Optimus Prime came home and got a day job.

Like Olympic skiers racing in single file to reduce air resistance, two 18-wheeler trucks in Nevada recently proved that uncomfortably close convoys can save drivers fuel and money. The key, instead of bold Olympic athleticism, is robotic assistance. A computer-assisted truck was able to follow closely behind a human-driven truck perfectly, maintaining exactly 33 feet of distance between the vehicles. The promise is a future of safer, more fuel efficient, and more robotic trucking.