Written by Ellen Voie, President/CEO of Women In Trucking Association. Crushing Cones was written to give you an insight into what to expect if you choose to become a professional driver. During the course of training, you will crush a lot of cones as you become skilled at avoiding fixed objets! I learned to back a tractor-trailer combination in a straight line, parallel park with only ten feet to spare, and put the entire rig into an imaginary dock at a 90 degree angle. The cones were my silent guides and suffered the indignity of being flattened as I learned.