The N1 then becomes the Ben Schoeman Highway, heading northwards towards Pretoria (Passing through Midrand); this section carries 300,000 vehicles per day and is purported to be the busiest stretch of road in South Africa. At Centurion, the N1 meets the N14 and they switch highways, with the N14 becoming the Ben Schoeman Highway to Pretoria Central and the N1 becoming the Pretoria Eastern Bypass (named the Danie Joubert Freeway) towards the north-east, proceeding to intersect with the R21 Highway from Johannesburg International Airport at the Flying Saucer Interchange before Pretoria East. After the R21 interchange, the N1 proceeds in a more northerly direction through the eastern suburbs. East of Pretoria CBD, at the Proefplaas Interchange, The N4 National Route from Witbank in the east joins the N1 and they are one highway for a short distance northwards before the N4 becomes its own highway to the west (named the Platinum Highway) towards Rustenburg.