suzanne malveaux. a bus heading to oklahoma hit an impact buffer. at least 36 people have been taken to area hospitals, three with critical injuries. want to bring in bud gillette of our dallas affiliate ktvt joining us live from the scene of the crash. first of all, how did this happen? >> reporter: well, suzanne, this is a turnpike, the george h.w. bush turnpike. and it's a feeder road if you will to a straight line to oklahoma. it's believed that's where the bus was headed this morning. i can stand back here and zoom in. still a very active scene. you hear helicopters overhead. what we're told the bus headed in the direction you're looking at northbound hit what's called a rubber impact and that is essentially a rubberized barrier to keep people in the highway. well, it hit that rubber barrier, went across that lane of traffic, the next lane of traffic and then hit a concrete barrier that separates the lanes. and at that time it flipped