Traffic is backed up for miles this morning westbound on US 93 northwest of Wickenburg. A tractor trailer rolled over in the Wickenburg Ranch roundabout. Crews are working to remove the wreckage, but it will take some time, according to Wickenburg Fire Chief Ed Temerowski. The trailer has to be unloaded before it can be removed from the scene, and clean up crews will have to take care of a fuel spill from the overturned truck. Traffic is down to one lane westbound and is completely stopped at times as they work the scene.