The Pretoria Ring Road, also known as the Pretoria Bypass, is a collection of two bypasses that together form a partial ring road around the city of Pretoria, South Africa. It consists of a section of the N1 Highway (known as the Eastern Bypass) as well as a section of the N4 Highway (known as the Northern Bypass). It is entirely in the City of Tshwane Metropolitan Municipality. Route Eastern Bypass The Pretoria Eastern Bypass is formed by the N1 Highway, from the Brakfontein Interchange with the Ben Schoeman Freeway (N1; N14) in Centurion to the Doornpoort Interchange with the Platinum Highway (N4) in northern Pretoria, a length of approximately 30 km. It heads north-east from Brakfontein (bypassing Centurion CBD) and then turns north after the Flying Saucer Interchange with the R21 Highway, eventually reaching the Proefplaas Interchange east of Pretoria CBD, where it meets the N4 Highway (Maputo Corridor) coming from eMalahleni and Mbombela the east. Here, the N4 designation joins the N1 northwards to be co-signed for 12 km up to the Doornpoort Interchange, where the N4 becomes the Platinum Highway (Pretoria Northern Bypass) westwards towards Brits and Rustenburg while the N1 continues north on its present highway towards Mokopane and Polokwane. The section of the Eastern Bypass from the Brakfontein Interchange to the Proefplaas Interchange, which is known as the Danie Joubert Freeway, is an e-toll highway (with open road tolling) while the remaining 12 km section to Doornpoort is an ordinary toll road with physical toll booths at the northbound ramp exits. At the Doornpoort Interchange is the Pumulani Toll Plaza on the N1 north and the Doornpoort Toll Plaza on the N4 west. SANRAL maintains the e-toll section while Bakwena maintains the N1/N4 section from the Proefplaas Interchange northwards. At the Brakfontein Interchange, a highway links south-west to Krugersdorp (designated as the N14) while the Ben Schoeman Freeway links north to the Pretoria CBD (designated as the N14) and south to Midrand and Johannesburg (designated as the N1). Northern Bypass The Pretoria Northern Bypass is formed by the N4 Highway, from the Doornpoort Interchange with the N1 Highway (Eastern Bypass) to the Brits Toll Plaza, a length of approximately 36 km. It heads west from the Doornpoort Toll Plaza, bypassing Wonderboom Airport and Onderstepoort, to reach an interchange with the R80 Highway (Mabopane Highway; which connects with Mabopane and Soshanguve in the north) in Akasia.