speed up in 1994, when the National Assembly enacted the first National Motorway Construction Programme. Till February 2012, a network consisting of of motorways, expressways and similar roads has been built. Its essential section, the Slovenian Motorway Cross, which is part of the Trans-European Road network, was completed in October 2011. It comprises the motorway route heading from east to west, in line with the Pan-European Corridor V, and the motorway route heading in the north–south direction, in line with the Pan-European Corridor X, part of which is considered the Slovenian transport backbone. The newly built road system slowly, but steadily transforms Slovenia into a large conurbation and connects it as a unitary social, economic and cultural space, with links to neighbouring areas. In contrast, other state roads, managed by the Slovenian Infrastructure Agency (until January 2015 named Slovenian Roads Agency), have been rapidly deteriorating due to neglect and the overall increase in traffic. About half of them are in a bad condition. The urban and suburban network served by buses is relatively dense. Highways The first highway in Slovenia, the A1, was opened in 1958 as part of the major Yugoslav project of the Brotherhood and Unity Highway. The section between Ljubljana and Zagreb was built by 54,000 volunteers in less than eight months in 1958. It connects Vrhnika and Postojna. Constructed under the liberal minded government of Stane Kavčič their development plan envisioned a modern highway network spanning Slovenia and connecting the republic to Italy and Austria. After the liberal fraction of the Communist Party of Slovenia was deposed, expansion of the Slovenian highway network came to a halt. In the 1990s the new country started the 'National Programme of Highway Construction', effectively re-using the old communist plans. Since then about 400 km of motorways, expressways and similar roads have been completed, easing automotive transport across the country and providing a strong road service between eastern and western Europe. This has provided a boost to the national economy, encouraging the development of transportation and export industries. There are two types of highways in Slovenia. Avtocesta (abbr. AC) are dual carriage way motorways with a speed limit of 130 km/h. They have green road signs as in Italy, Croatia and other countries. A hitra cesta (HC) is a secondary road also a dual carriageway but without a hard shoulder for emergencies. They have a speed limit of 110 km/h