It is highly recommended that visitors plan every route in advance, not only according to electronic systems, but with hotel concierges, clerks at tourist kiosks or any other knowledgeble party providing accomodations - in relation to the size of rio de janeiro navigating the streets is complicated and invovles vigilant attention.

when renting a car it is recommended to pick plain cars with dark windows - one should not drive with windows open or playing loud music since it is disruptive to residental neighborhoods and can attract unwanted attention - making sure to lock doors and wear seatbelts are always important practises to embody  in any car.

some drivers in rio do not carry insurance, so it is possible, that in case of accidents, one would not be able to collect on damages - purchase of separate and appropriate insurance is always a good idea.

if an individual wants to check traffic conditions in the city, along with local maps and cameras, information is available here - this city offical link is provided by the governement and is a great resource for visitors - clicking here provides informaiton on rio's traffic department  and if involved in an accident, individuals can find more information here.