Federal investigators say a collision between an experimental self-driving shuttle and a semi in downtown Las Vegas was probably the truck driver's fault. But the shuttle operator didn't have quick access to a controller that could have honked the horn or moved the shuttle, contributing to the accident.
No one was hurt in the Nov. 8, 2017 crash, which was among the first involving a fully autonomous vehicle. The National Transportation Safety Board investigated it because of the new technology.
The NTSB says in a report Thursday that the driver was backing into an alley and expected the shuttle to stop a safe distance away, but it didn't. The shuttle's sensors detected the semi and slowed its speed. The operator stopped it but the truck continued to back up.