ays in prison and €5000 for causing a larger traffic accident (both locals and foreigners). IMPORTANT! If you are driving on country and local roads, pay attention to the bicycle riders, tractors and other heavy agricultural machines, especially at night! They can be without proper light signalization and hard to see, so slow down at night.
The highway is tolled, but the toll is no longer higher for foreigners than for locals. Highway tolls cost on average 0.03€/km and can be paid in Serbian dinars or Euros. They are charged by road section, so it's possible to pay more if only part of section is used.
By bus
Vienna - Buses leave from Vienna International Busterminal (Erdberg) almost every day. For destinations south of Belgrade, Zoran Reisen coaches leave at 3PM on Friday, and charge around €45 for a one-way trip.
Hungary - When you take an international bus from Belgrade towards Germany, a collection is often held inside the bus for paying the Hungarian border guards a fee to let the bus go faster over the border. This is a bribe. On your way into Serbia, it seems cheaper, though the Hungarian border guards will demand all passengers sign a form declaring they offered no gift, cash or otherwise, to Hungarian border police whether they paid a bribe or not.
For more information, see the timetable (arrivals/departures) of the Belgrade bus station (in English):
By boat
There are boat tours, which pass through Belgrade. These are Trafalgar Tours in English, which cruise along the Danube and have a two day stopover in Belgrade.
By thumb
Hitchhiking across Serbia is still acceptable and most drivers will treat you like a friend. However, necessary precautions should still be taken. Generally, it is easy to hitchhike through Vojvodina and much more difficult to hitch a ride from Belgrade to the south, to Kosovo, or Macedonia and Montenegro. The Hitchhiker's Guide to Serbia
