was tired. >> the cause of the crash, is attributed to a fatigued driver. the driver was fatigued. >> reporter: chung has been charged with reckless driving. in washington just this past weekend, another accident. a tour bus struck a parked pickup truck. >> the bus then rolled on to its side. and sadly two people inside the bus did die. >> reporter: back in march, in another crash, this one in new york, 15 people were killed. and days later, two more died in a new jersey crash. buses are still the cheapest way to travel, but there are questions about their safety. the national transportation safety board is currently probing the low cost tour bus industry in the wake of recent deadly crashes during a sting operation a few months ago in new york, investigators pulled over 14 tour buses and ordered all of them off the road after discovering major vehicle safety issues and infractions. the ntsb will look into the tuesday morning crash in