By | June 02 2011 4:08 PM

In March, a Chinatown bound bus returning from a casino careened off the road and was shorn in half, killing 15 people. Two days later, a driver and a passenger perished when a bus traveling from New York to Philadelphia hurtled into an embankment off the side of the New Jersey Turnpike. And on Tuesday, a bus owned by Sky Express rolled over in Virginia, killing four people.