`` S do Senna '' connects with `` Curva do Sol '' ( Sun Turn ) , a large-radius left-turn that leads to `` Reta Oposta '' ( Opposite Straight ) . This refers to the unused back straight of the pre-1990 circuit . `` Senna 's S '' connects with `` Curva do Sol '' ( `` Sun Turn '' ) ( 3 ) , a round-shaped large-radius left-turn that leads to `` Reta Oposta '' ( `` Opposite Straight '' , a reference to the disused longer back straight of the pre-1990 circuit , to which it runs parallel ) , the track 's longest ( but not the fastest ) straight .