MIAMI (AP) — At Miami International Airport, two large signs warn drivers of large vehicles not to pass beneath the 8-foot-6 inch concrete overpass. Authorities say two passengers are dead and others have been critically injured after a too-tall charter bus smashed into the overpass, crumpling metal.

One of the signs attached to the top of the concrete barrier reads: “High Vehicle STOP Turn Left.” The other, placed to the left of the driveway and several feet in front of the barrier, says all vehicles higher than the 8-foot-6 threshold must turn left.