There are signs in the airport and vehicles that transport customers to the agency. Although it is easy to rent a car in Brazil, gas is expensive and driving can be hazardous for those not familiar with the norms.
Traffic is heavy.
At night, drivers tend not to stop for red lights, so be especially careful at intersections. Sometimes individuals who do stop are in danger of being robbed or kidnapped, so the tendency is to just slide through the intersection. Doors should be kept locked at all times. Parking the car involves paying someone to watch it or pre-purchasing a block of parking passes from someone on the street. When exiting the car, it is good to take the cellular phone and stereo, if it is detachable.