The road rules in Buenos Aires and most of Argentina in fact, are treated more like suggestions by the locals so the most important part of driving would be to be defensive. Stay away from crowded areas and work out beforehand the route you are going to take. Also remember that Argentina has one of the highest motor vehicle accident mortality rates in the world, and you don’t want to turn your holiday into a hospital stay.
The maximum speed limit on motorways is 130kph; which goes down to 80kph on one-lane roads, while the speed limit in built-up areas can vary (40-60kph). The wearing of seat belts is compulsory, and as mentioned before, the Automóvil Club Argentino offers breakdown assistance and reciprocal benefits for members of motoring organizations in other countries. Website: www.aca.org.ar