DETROIT—The U.S. government’s highway safety agency is investigating complaints that the automatic emergency braking on big Freightliner semis can stop the trucks unexpectedly for no apparent reason.
It’s at least the third recent investigation by the National Highway Traffic Safety Administration (NHTSA) into glitches with the technology, which has the potential to save lives because it can make vehicles stop or slow down for stopped or slowed traffic.
The probe covers about a quarter-million trucks made by Daimler from the 2017 through 2022 model years.
The agency says in documents posted on its website on May 30 that it has 18 complaints from owners alleging that brakes on Freightliner Cascadia trucks can come on without an obstacle in the road….