This Order continues indefinitely the provisions of the 70 miles per hour, 60 miles per hour and 50 miles per hour (Temporary Speed Limit) Order 1977, as varied by the 70 miles per hour, 60 miles per hour and 50 miles per hour (Temporary Speed Limit) (Variation) Order 1978. These Orders provided, during the period from 31st May 1977 to 30th November 1978, for a 70 mph general speed limit on dual carriageway roads (not being motorways), for a 60 mph general speed limit on single carriageway roads (not being motorways) and for 60 and 50 mph speed limits on certain specified lengths of dual and single carriageway roads respectively.