A witness told CNBC the driverless Cruise vehicles did not appear to detect and avoid the caution tape and bus wires, and instead became “tangled in them.”

U.S. automotive safety officials have opened a formal probe into the autonomous driving system used by General Motors’ self-driving vehicle unit Cruise.

Chinese tech company Baidu said its robotaxi business in large cities is close to gaining the same traction with locals as traditional ride-hailing services.