General Brazilian
estrada de alto tráfego / rodovia movimentada
Both terms are commonly used in Brazil
São Paulo
via de tráfego intenso / pista movimentada
Urban context; 'pista' frequently used for major city roads
Rio de Janeiro
estrada congestionada / via principal
Common in traffic reports and news
Portugal
estrada com trânsito intenso / via congestionada
Portuguese European usage; often refers to EN (Estradas Nacionais) routes