<P> Different default speed limits apply to particular categories of roads . Default speed limits are termed as "ordinary speed limits" by the Road Traffic Act 2004 . There are also speed restrictions for certain classes of vehicles . As of 2007, the ordinary speed limits are as follows: </P> <Ul> <Li> 120 km / h (75 mph) for motorways </Li> <Li> 100 km / h (62 mph) for National Routes (Primary and Secondary) that are not motorway status . </Li> <Li> 80 km / h (50 mph) for local and regional roads . </Li> <Li> 50 km / h (31 mph) in built up areas . </Li> </Ul> <Li> 120 km / h (75 mph) for motorways </Li> <Li> 100 km / h (62 mph) for National Routes (Primary and Secondary) that are not motorway status . </Li>

What is the maximum speed limit on national roads in ireland