Even in certain "pacified" favelas, the ability of police to supply support, Specially during the night, could be limited. Several local corporations give "favela jeep tours" targeted at foreign holidaymakers. Bear in mind that neither the tour enterprise nor the city police can warranty your basic safety when entering favelas. https://wiki.cntechapp.com/how-to-breakthrough-the-better-automobile-touch-on-kernel-20-3869554331751359545