The South African province of Gauteng is to undertake a US$3.1 billion upgrade programme on the heavily congested N1 freeway. The N1, which links Pretoria and Johannesburg, carries 180,000 vehicles daily. Work is slated to begin early next year and take almost seven years to complete. However, precise dates are currently impossible to give because final environmental impact assessments have yet to be completed. Finance for the upgrade programme will be generated through the implementation of tolls, which are due to be introduced after 2010. All future upgraded freeways in the province will be tolled, with discounts available for regular users.