The chair of the National Transportation Safety Board is traveling to Louisville by truck.Deborah A.P. Hersman will left Washington D.C. Wednesday, in the passenger seat of a tractor-trailer. She will ride with five different truck drivers on her trip, which is meant to give her first-hand knowledge of the challenges drivers face and any potential safety hazards on the roads.Hersman will meet with transportation officials in West Virginia and Kentucky before arriving in Louisville Friday at the Mid-American Truck Show. Hersman holds a commercial driving license, and the truck show is expected to feature one of the largest gatherings of female truck drivers since a 2004 event in the Netherlands.