Motorways are dual carriageways with a speed limit of . Crossing dual carriageways (except motorways) is allowed only outside towns. East Sussex has no motorways, and even dual carriageways are sparse in the county. In Belgium, motorways but also some dual carriageways have numbers preceded by an A. Dual carriageways of this class differ from motorways in a number of ways. Traffic lights and junctions are permitted at grade on dual carriageways. Expressways in the Czech Republic (, are defined as dual carriageways with smaller emergency lane. Continental European non-motorway dual carriageways typically have limits set at for passenger cars. Continental European non-motorway dual carriageways can have limits as high as . The standard motorway speed limit for cars of also applies to many dual carriageways. This Act makes provision for the redesignation of suitable dual carriageways to motorway status. All RA have separate carriageways with two lanes in each direction. The same principle lies with dual carriageways with more than three lanes. They were constructed with dual three-lane carriageways. All other roads into the town are single carriageways.