The purpose of the main roads and regional roads is to provide intra-regional connections between regional centres of economic activity and households and connections to higher road categories. Traffic between neighbouring and/or distant regional centres is supported by motorways, which are designed to bear heavier loads.
In 1998 the Road Administration set up road signs, which prohibited the usage of parallel state roads, where the motorway existed, for all heavy vehicles exceeding 7.5 tonnes. In September 2000 the Government decided to remove the ban. Avoidance of toll stations by heavy vehicles could cause significant increases in economic and financial costs for road users and road maintenance, as well as increases in the external costs of traffic (traffic safety, noise, vibrations). On the other hand avoidances are also reflected by reduced toll revenues.