From Kroondal, the N4 continues eastwards for 36 kilometres, encountering the Marikana Toll Plaza, bypassing Mooinooi, to reach the town of Modderspruit (Bapong), where it meets a road (the R556 Road) which provides access to the famous resort of Sun City next to the Pilanesberg. It proceeds eastwards to reach an interchange with the R512 Road, which provides access to the city of Brits in the north and the city of Randburg (part of Johannesburg) via the western side of the Hartbeespoort Dam in the south.