Mouth ulcers are also a possible symptom of a viral infection that mainly affects young children, called hand, foot and mouth disease. Speak to your GP or call NHS 111 if you're unsure. Read about the symptoms of hand, foot and mouth disease.
It was not until 1965 that a national upper limit of 70mph was introduced for all roads, including motorways. Since 1977 the speed limit for cars and motorcycles on dual carriageways has been 70mph, with a 60mph speed limit on single carriageways.
Most speed limits are set by state or local statute, although each state allows various subdivisions (counties and municipalities) to set a different, generally lower, limit. The highest speed limits are generally 70 mph (113 km/h) on the West Coast and the inland eastern states, 75â80 mph (121â129 km/h) in inland western states, along with Arkansas and Louisiana, and 65â75 mph (105â121 km/h) on the Eastern Seaboard.