(Bloomberg) — A Wal-Mart Stores Inc. driver hit a limo van carrying comic Tracy Morgan last year because he was so fatigued he didn't notice traffic had slowed ahead of him, U.S. investigators found Tuesday.

The National Transportation Safety Board concluded that Wal-Mart could have done a better job of educating its drivers about the need for sleep. The driver had been awake for 28 hours and worked almost 14 hours at the time of the accident, the investigation found.

The Morgan crash sparked a national debate on truck safety, shining a spotlight on one of the most deadly highway-safety issues. The structure of rules designed to limit fatigue has been intensely debated in Congress. Meanwhile, truck-related accidents kill nearly 4,000 people a year.

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