It continues westwards to reach the Brits Toll Plaza, where it leaves the City of Tshwane Metropolitan Municipality, enters the North West Province and proceeds to Brits and Rustenburg. The Northern Bypass is part of the Platinum Highway maintained by Bakwena. Significance Before the opening of the Northern Bypass, the N4 National Route, which is coming from Witbank and Mbombela in the east, passed westwards through Pretoria from the Proefplaas Interchange on regular city streets (today designated as the M2 and M4 roads) and exited Pretoria westbound as the Magalies Toll Route, a 20 km tolled highway to Hartbeespoort. This new realignment of the N4 (the Northern Bypass) means that both Hartbeespoort and Pretoria Central are now bypassed to the north for east–west traffic. Traffic coming from Rustenburg in the west and heading towards towns east (and south) of Pretoria no-longer has to pass through the city centre and interfere with local traffic. Before the opening of the Eastern Bypass, the N1 National Route, which is coming from Johannesburg in the south, passed northwards through Pretoria on regular city streets (today designated as the R101) and exited Pretoria northbound on Lavender Road/Old Warmbaths Road. This new realignment of the N1 (the Eastern Bypass) means that Pretoria Central is now bypassed to the east for north–south traffic. Traffic coming from Polokwane in the north and heading towards towns south (and south-west) of Pretoria no-longer has to pass through the city centre. See also N1 (South Africa) N4 (South Africa) National Roads in South Africa References Ring roads in South Africa Toll roads in South Africa Transport in Pretoria N1 (South Africa)