By David Shepardson WASHINGTON (Reuters) – U.S. traffic deaths jumped 10.5% in 2021 to 42,915, regulators said on Tuesday in a preliminary estimate, marking the highest number killed on American roads in a single-year since 2005. The yearly increase is the highest reported since the National Highway Traffic Safety Administration (NHTSA) began using its current traffic fatality tracking system in 1975. The number of pedestrians killed jumped 13% to 7,342, hitting the highest number since 1981 https://www.nhtsa.gov/sites/nhtsa.gov/files/documents/812502_pedestrian-and-bicyclist-data-analysis-tsf…