Roads & Bridges

Gauteng Freeway Improvement Project

South Africa

Gauteng Freeway Improvement Project
Description

WBHO completed a 21km upgrade of South Africa’s National Route 1.

With over 180,000 vehicles daily, the N1 is the Southern Hemisphere’s busiest road. WBHO’s scope of works included Key project components included:

  • The existing, 13.4m-wide median was utilised to provide a fourth lane in each direction, with full shoulder lanes
  • At all interchange approaches, an auxiliary lane was provided, with lengths from ramp yellow breakline point varying between 300m to 500m
  • WBHO constructed a variety of retaining wall structures for retaining earth and for drainage
  • Delivery of nine bridges (either newly constructed or upgrades to existing bridges). Bridges included road-over-rail, road-over-river and a pedestrian bridge. To minimise disruption, bridge construction methodology included offsite prefabrication
  • 10,000m2 of retaining walls, 38,000 linear metres of soil and rock anchors and piling work.

WBHO completed the work well ahead of schedule, despite the inclusion of a number of variations during the project period.