From the article: It is common for developers to disable built-in vehicle features such as automatic braking to avoid multiple systems issuing conflicting comm

From the article: It is common for developers to disable built-in vehicle features such as automatic braking to avoid multiple systems issuing conflicting commands, said Raj Rajkumar, a Carnegie Mellon University professor who founded and later sold an autonomous-car software startup. The problem with Uber’s approach, he said, is the company didn’t replace Volvo’s system with its own automatic emergency braking. Instead, Uber relied on the safety operator, who was seemingly distracted and didn’t receive a warning to brake or swerve, he said.