The Tri-State Transit Authority (TTA), which markets itself as "THE Transit Authority, is the city bus system in Huntington, West Virginia, and Ironton, Ohio, as well as its suburbs. Its buses range, on the West Virginia side from 19th Street West in Huntington to Milton, West Virginia, about 20 miles to the east. On the Ohio side the buses range from downtown Ironton to the Huntington suburb of Proctorville, Ohio, which is also a range of about 20 miles. Interchange buses provide links between Huntington and Chesapeake, Ohio, and between Ironton and Ashland, Kentucky, where transfers are available to the Ashland Bus System.