GM adds highways to semi-autonomous driving system

DETROIT (AP) — General Motors is adding 70,000 miles (113,000 kilometers) of roads across the U.S. and Canada to the area where its Cadillac Super Cruise semi-autonomous driving system can run, including some with cross traffic similar to those that have confused Tesla’s Autopilot system.
Currently the GM system can travel on 130,000 miles (210,000 kilometers) of limited-access highways that don’t have crossing traffic or intersections. It will rise to 200,000 miles (320,000 ki