Excerpt from an article on cnn.com:
Ganim, Sara and Zamost, Scott.“Asleep at the wheel? Greyhound fails to enforce its own safety rule”CNN Investigations. Web. 23 May 2016.

Greyhound is the largest bus company in North America. Eighteen million passengers ride Greyhound buses some 5.5 billion miles every year across the country. Most trips are routine, but when a major accident happens, it sheds a light on a longstanding issue in the passenger bus industry: driver fatigue.

A government study from 2012 found 37% of all passenger bus crashes were due to driver fatigue.

Of the 184 fatal crashes involving a passenger bus from 2010 to 2014, five were due to driver fatigue, according to the National Highway Traffic Safety Administration.

Greyhound has a "satisfactory rating" from the Department of Transportation.

Greyhound's most recent major accident happened in January near San Jose, killing two people.A California Highway Patrol officer said the driver had mentioned being fatigued before the crash, which is still under investigation. It's unclear if he followed the 150-mile rule.

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Read the full article: http://www.cnn.com/2016/05/23/us/greyhound-investigation/index.html