You’ll Likely Be Seeing Lime-Yellow Help Trucks From The Tennessee Department Of Transportation Traveling Across The State As Well As The Tri Cities Region Soon. Their Purpose Will Be To Assist The Motoring Public During Heavier Than Normal Traffic During The Holidays. The Trucks On The State’s Most Heavily Traveled Highways. In Addition, Tdot’s Help Trucks Will Conduct Daily Patrols Along Interstate 26 In Sullivan And Washington Counties From December 21st Through The 23rd And Then Again On December 26th Through The 30th.