Ummmmmmmm Once we had a contractor usin some really old equipment that did leave a truck supportin the wire across a hwy crossing. They didnt realize or consider that the Hydraulics tended to leak down over time. We had to get those folks out there to start the truck and raise the boom back to its original position several times. Needless to say they got reamed for it on Monday morning. Left unchecked it could have been a major accident.