Is the word tráfego the same in Brazilian and European Portuguese?

No.

The difference lies in the scope of usage. In Brazil, the word "tráfego" is primarily used in technical or specialized contexts to describe the flow of non-vehicular elements, such as "tráfego aéreo" (air traffic) or "tráfego de dados" (data traffic). For road and vehicular movement, Brazilians almost exclusively use the word trânsito. In Portugal, while "trânsito" is also used, "tráfego" is the standard and natural way to describe the flow of cars and vehicles on the streets and highways.

Brazilian Portuguese (using "tráfego" in its natural, technical context):

1. O tráfego aéreo está muito intenso hoje. (Air traffic is very intense today.)
2. Precisamos monitorar o tráfego de dados na rede. (We need to monitor the data traffic on the network.)
3. O tráfego de pessoas no evento foi controlado. (The flow of people at the event was controlled.)
4. Houve um aumento no tráfego de mercadorias. (There was an increase in the flow of goods.)
5. O tráfego de internet caiu durante a madrugada. (Internet traffic dropped during the night.)

European Portuguese (using "tráfego" for road and vehicular movement):

1. O tráfego na autoestrada está parado. (Traffic on the highway is stopped.)
2. O tráfego automóvel está muito pesado na cidade. (Car traffic is very heavy in the city.)
3. É necessário reduzir o tráfego de camiões nesta zona. (It is necessary to reduce the flow of trucks in this area.)
4. O tráfego urbano é um problema constante. (Urban traffic is a constant problem.)
5. O tráfego de veículos ligeiros aumentou muito. (The flow of light vehicles has increased significantly.)