After crash that killed 6 teens, NTSB chief says people underestimate marijuana’s impact on drivers

DETROIT (AP) — A horrific crash that killed six high school girls in Oklahoma two years ago has the head of the U.S. National Transportation Safety Board urging parents to warn teenagers about the risk of driving after using marijuana.

Chairwoman Jennifer Homendy made the appeal to parents Thursday as her agency released the final report on the March 22, 2022 collision between a tiny Chevrolet Spark hatchback and a gravel-hauling semi in the small town of Tishomingo.

The board, after an investigation by its staff...