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.
All of the roads in the US have a speed limit, the average being around 75 mph, with some areas in Texas and Utah reaching 80 mph. Road speed limits are used in most countries -- and are endorsed by the World Health Organization -- as a way to reduce road casualties. The highest speed limit ever introduced was in Abu Dhabi between 2005 and 2010 where the limit was set at 99 mph. The speed limit was reduced in 2011 to 87 mph. In Germany, some autobahns have no speed limit, but an advisory limit of 130 km/h (80 mph) was established in 2008.