Tráfico is a false friend worth being familiar with, as it appears on the media on a regular basis. In Portuguese, tráfico relates exclusively to trafficking or dealing. When there is no specific mention to the nature of the trafficking, that is, when tráfico appears on its own, it invariably means drug trafficking. So the vítimas do tráfico are the victims of drug trafficking rather than the casualties of road accidents.
The translation of traffic into Portuguese, when it refers to the movement of vehicles, is trânsito (or the less frequente tráfego).