Ljubljana is located where Slovenia's two main freeways intersect, connecting the freeway route from east to west, in line with Pan-European Corridor V, and the freeway in the north–south direction, in line with Pan-European Corridor X. The city is linked to the southwest by A1-E70 to the Italian cities of Trieste and Venice and the Croatian port of Rijeka. To the north, A1-E57 leads to Maribor, Graz and Vienna. To the east, A2-E70 links it with the Croatian capital Zagreb, from where one can go to Hungary or important cities of the former Yugoslavia, such as Belgrade. To the northwest, A2-E61 goes to the Austrian towns of Klagenfurt and Salzburg, making it an important entry point for northern European tourists. A toll sticker system has been in use on the Ljubljana Ring Road since 1 July 2008. The centre of the city is more difficult to access especially in the peak hours due to long arteries with traffic lights and a large number of daily commuters. The core city centre has been closed for motor traffic since September 2007 (except for residents with permissions), creating a pedestrian zone around Prešeren Square.