national speed limit on a single carriageway uk
Road speed limits in the United Kingdom The national speed limit is 70 mph (112 km/h) on motorways, 70 mph (112 km/h) on dual carriageways, 60 mph (96 km/h) on single carriageways and generally 30 mph (48 km/h) in areas with street lighting (restricted roads). These limits may be changed by road signs and apply to cars, motorcycles, car-derived vans up to 2 tonnes maximum laden weight (MLW), and to motorhomes or motor caravans not more than 3.05 tonnes maximum unladen weight. Other classes of vehicles are subject to lower limits on some roads.[1]
Metrication in Ireland Distance signs had displayed kilometres since the 1970s but road speed limits were in miles per hour until January 2005, when they were finally changed to kilometres per hour. Since 2005 all new cars sold in Ireland have speedometers that display only kilometres per hour; odometers generally became metric as well.