San Francisco—The U.S. transport safety regulator said on Thursday that it has launched an investigation into 1,732,000 Honda Motor vehicles over unexpected braking activation. The National Highway Traffic Safety Administration said it has received a total of 278 complaints that allege braking incidents “occurring with nothing obstructing the vehicle’s path of travel.” The 2018–2019 model year Honda Accord and 2017–2019 model year Honda CR-V will be affected by the probe, the NHTSA said.