ADOT says a two-vehicle collision this morning on southbound I-17, south of Camp Verde, has traffic backed up for miles. DPS Spokesperson Quentin Mehr says two commercial vehicles collided just after 6-am, sending one of the vehicles partially down an embankment off the road.He says no injuries were reported and emergency crews are continuing to work to remove the commercial vehicles. The left lane is blocked and at last report traffic was backed up for over 5 miles.