Tesla reports 273 crashes involving driving tech

Automakers reported nearly 400 crashes over a 10-month period involving vehicles with partially automated driver-assist systems, including 273 with Teslas, according to statistics released Wednesday by U.S. safety regulators.

The National Highway Traffic Safety Administration cautioned against using the numbers to compare automakers, saying it didn't weight them by the number of vehicles from each manufacturer that use the systems, or how many miles those vehicles traveled. Automakers reported crashes from July of last year through May 15 under an order from the agency, which is examining such crashes broadly for the first time. The agency is assessing how the systems perform and whether new regulations may be needed.