Civil Designer Showcase


At Knowledge Base we are proud to showcase the achievements of our successful clients who continue to make a big difference through the work they do. HHO Africa ( is a well established and broad based consulting civil engineering company, recognised for their excellence in planning and design through numerous awards for technical excellence, innovative and environmental sensitivity.

The National Route N11 (Section 10) is a single carriageway which links the towns of Middelburg (km 0) and Groblersdal (km 81) in the province of Mpumalanga. The route then continues, crossing the N1 and ending at the Zimbabwean border. HHO Africa were appointed by the South African National Roads Agency Limited (SANRAL) to carry out the detailed assessment and design for the rehabilitation of the road pavement, bridge structures, drainage culverts and safety measures. The assessment included an investigation into the unstable cut slopes as well as geometric improvements at intersections and within the Kranspoort Pass.

Features of the project include :
  • Carrying out detailed visual pavement
  • assessment
  • Carrying out condition assessment of
  • bridges and culverts
  • Pavement material profiling and sampling
  • Materials behaviour assessment
  • In-situ recycling of existing base for a
  • subbase
  • Providing a new granular base to a new
  • overlay alignment
  • Bridge and culvert widening
  • New bridge design
  • New climbing lanes and shoulder
  • widening
N11 Upgrade
Repairs to existing bridge

N11 Upgrade
Pavement condition

N11 Upgrade
Disintegration of patch repairs.

HHOAfrica were responsible for the following :
  • All civil and structural design
  • Traffic planning and management
  • Contract documentation and tender
  • adjudication
  • Contract administration and construction
  • monitoring

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