A valid drivers licence (printed in English) or an International Drivers Licence is required for Zambia and traffic keeps to the left. Though there is an extensive road network throughout the country, many tarred roads are incredibly potholed whilst many sand/dirt roads are in immaculate condition. The roads in some national parks are impassable in the wet season, even in a 4X4. It is best to talk to locals about road conditions before embarking on your journey. If you are planning on going off-road then be sure to carry a shovel to dig yourself out of the sand, and an axe to cut wood for traction. Zambian Traffic Police set up numerous roadblocks throughout the country and will check vehicles for most every infraction. It may seem a pain, but note that many taxis and minibuses are barely running, let alone roadworthy so it is in the best interest of everyone. As long as all of your lights are working, you are carrying your paperwork (including third party insurance), your passport, drivers licence, road triangles (yes, they will ask!) and have reflective tape on the front and rear of your vehicle then you should have no problems. Fuel and car hire are expensive in Zambia so renting/buying a car in South Africa or Namibia or taking local buses is usually the best option.