Roads that do not allow large vehicles may be marked with the traffic signs. These may include per-axle load, height, width, or overall length limits. In the United States an oversize load is a vehicle and/or load that is wider than 8 ft 6 in (2.59 m). Each individual state has different requirements regarding height and length (most states are 13 ft 6 in or 4.11 m tall), and a driver must purchase a permit for each state he/she will be traveling through.