Tesla car 'was speeding at time of crash'

The driver killed when his Tesla car crashed while in self-driving mode was travelling at 9mph above the speed limit just before hitting the side of a tractor-trailer, federal accident investigators have said.

Data downloaded from the Tesla Model S shows the vehicle was travelling at 74mph in a 65mph zone on a divided highway in Williston, Florida, near Gainesville, the National Transportation Safety Board (NTSB) said in a preliminary report.