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Senior Democrats in the Senate are pressing for transportation safety enhancements as the White House celebrated the anniversary of a $1 trillion infrastructure law’s enactment.

With continuing concerns about speeding on the nation’s highways, the National Highway Traffic Safety Administration plans to conduct a survey-research effort to ask 1,500 drivers with one or more recent speeding tickets why they speed — and why others with no violations don’t speed.

Traffic fatalities on U.S. roads declined in the second quarter, halting an almost two-year rise even as Americans are driving more.

The National Highway Traffic Safety Administration is operating without a Senate-confirmed leader again, leaving a void atop the agency tasked with preventing road injuries and deaths even as the number of fatalities moves sharply in the wrong direction.

Traffic fatalities on U.S. roads grew 7% in the opening three months of the year, reaching the highest levels for the first quarter since 2002.

Steven Cliff, the head of the National Highway Traffic Safety Administration, is stepping down from his post for a leadership role at the California Air Resources Board.

DETROIT — Two crashes involving Teslas apparently running on Autopilot are drawing scrutiny from federal regulators and point to a potential new hazard on U.S. freeways: The partially automated vehicles may not stop for motorcycles.

WASHINGTON — The new head of the government’s road safety agency says it will intensify efforts to understand the risks posed by automated vehicle technology, so it can decide what regulations may be necessary to protect drivers, passengers and pedestrians.

The National Highway Traffic Safety Administration, for the first time, collected and analyzed data on crashes involving vehicles using SAE Level 2 advanced driver assistance systems, and separately, SAE Levels 3-5 automated driving systems.

DETROIT — Tesla reported 273 crashes involving partially automated driver-assist systems, according to statistics about the industry released by U.S. safety regulators on June 15.