The road freight and passenger transport constitutes the largest part of transport in Slovenia at 80%. Personal cars are much more popular than public road passenger transport, which has significantly declined. Slovenia has a very high highway and motorway density compared to the European Union average. The highway system, the construction of which was accelerated after 1994, has slowly but steadily transformed Slovenia into a large conurbation. Other state roads have been rapidly deteriorating because of neglect and the overall increase in traffic.