"Droga ekspresowa" (plural: "drogi ekspresowe") in Poland refers to a network of roads fulfilling the role of bringing traffic to the motorways, and serving major international and inter-regional purposes. They are often built as ring roads since they take less space than motorway and allow more entrances and exits. All expressways start with the letter S, followed by a number. They can be dual or single carriageways and have reduced number of one level intersections. As of May 2004 the Polish government documents indicated that the country had plans of an expressway and motorway network totalling (including about of motorways). The speed limit is 120 km/h (dual carriageway) and 100 km/h (single carriageway).