Entrepreneur Elon Musk’s Boring Co. has dropped plans to construct a tunnel beneath Sepulveda Boulevard in Los Angeles after a settlement with project opponents. Announced in late 2017, the tunnel was to serve as a proof-of-concept for a proposed underground transit system that would ferry cars on sleds at speeds up to 155 mph. Plans to exempt the tunnel from a full environmental review angered local opponents, who sued the city in May to halt the project. Another Boring Co. project, a 3.5-mile subway tunnel linking the Red Line subway to Dodger Stadium, now is in early environmental review.