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The National Highway Traffic Safety Administration unveiled the final version of the new regulation on Monday and called it the most significant safety rule in the past two decades.

Toyota issued a "Do Not Drive" advisory for thousands of older models in the U.S., warning that a faulty air bag inflator has the potential to explode and seriously injure drivers or passengers.

Although the study authors say the results can't be used to gauge drug use on the roads nationwide, the high number of drivers, passengers and others with drugs in their systems is concerning.

The network that motor vehicle agencies around the U.S. use to verify critical information went down Monday morning. It took roughly four hours to fix the problem.

A component responsible for detecting a crash and deploying air bags has been malfunctioning owing to electrical interference, the National Highway Transportation Safety Administration says.

Reports of thousands of fires and a petition from a consumer advocacy group led the auto regulator to open new investigations into fires that were not sparked by a collision.

The U.S. government has finalized rules requiring so-called "quiet cars" to make alert beeps when traveling at low speeds. Officials hope pedestrians will be safer if they can hear vehicles coming.