<P> Ever since they have been introduced, speed limits have been controversial . They have either been opposed or supported from various sources; including motoring advocacy groups, anti-motoring groups and others who either consider them to be irrelevant, set too low or set too high . </P> <P> Default maximum speed limits apply to all roads where no specific lower numeric speed limit is already in force . The default speed limit is known as the national speed limit (NSL). The NSLs vary by road type and for vehicle types . </P> <Table> National speed limits by vehicle type and road type <Tr> <Th> </Th> <Th> Restricted road </Th> <Th> Single - track road </Th> <Th> Single carriageway </Th> <Th> Dual carriageway </Th> <Th> Motorway </Th> </Tr> <Tr> <Td> Cars and motorcycles (including car - derived vans up to 2 tonnes max laden weight) </Td> <Td> 30 mph (48 km / h) </Td> <Td> 60 mph (97 km / h) </Td> <Td> 60 mph (97 km / h) </Td> <Td> 70 mph (113 km / h) </Td> <Td> 70 mph (113 km / h) </Td> </Tr> <Tr> <Td> Vehicles towing caravans or trailers inc cars, motorcycles, goods vehicles up to 7.5 tonnes MLW </Td> <Td> 30 mph (48 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 60 mph (97 km / h) </Td> <Td> 60 mph (97 km / h) </Td> </Tr> <Tr> <Td> Buses, coaches, minibuses up to 12 metres (39 ft) Goods vehicles up to 7.5 tonnes MLW </Td> <Td> 30 mph (48 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 60 mph (97 km / h) </Td> <Td> 70 mph (113 km / h) </Td> </Tr> <Tr> <Td> Goods vehicles over 7.5 tonnes MLW (in England and Wales) </Td> <Td> 30 mph (48 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 60 mph (97 km / h) </Td> <Td> 60 mph (97 km / h) </Td> </Tr> <Tr> <Td> Goods vehicles over 7.5 tonnes MLW (in Scotland, except A9 Perth to Inverness) </Td> <Td> 30 mph (48 km / h) </Td> <Td> 40 mph (64 km / h) </Td> <Td> 40 mph (64 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> 60 mph (97 km / h) </Td> </Tr> <Tr> <Td> Goods vehicles over 7.5 tonnes MLW (on A9 Perth to Inverness) </Td> <Td> 30 mph (48 km / h) </Td> <Td> n / a </Td> <Td> 50 mph (80 km / h) </Td> <Td> 50 mph (80 km / h) </Td> <Td> n / a </Td> </Tr> </Table> <Tr> <Th> </Th> <Th> Restricted road </Th> <Th> Single - track road </Th> <Th> Single carriageway </Th> <Th> Dual carriageway </Th> <Th> Motorway </Th> </Tr>

What is the national speed limit in wales
find me the text answering this question