In Brazil you drive on the right with overtaking on the left. Brazil is not the safest place in the world to drive with unpredictable drivers, roads and relatively high rates of accidents and theft. Brazil has one of the highest fatality rates in the world. Fire extinguishers and first aid kits should be carried in cars in Brazil. You should always keep your doors locked at night to prevent car jackings and watch out that cars do not box you in at red lights. Although most of the main state roads are in good condition, elsewhere in the country pot holes and animals are a major cause of road accidents and so driving at night should be avoided where possible. Driving during or after the rainy season can also be hazardous. Watch out for unmarked speed bumps in places.
In Brazil drivers warn cars behind them not to pass with a flashing left signal. This could be for a number of reasons but generally indicates that it is not safe to overtake. Cars that come towards you flashing their headlights are warning you of impending obstacles such as animals or the presence of the police. Trucks should always be viewed with caution as there is no law which requires truck drivers to stop regularly and rest. Brazilian drivers may well stop suddenly if they see a speed camera.