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 The life of any particular road is a function both of its design and the degree of maintenance applied. 

Road Design Components:

Road Classification

  • Roads are typically classified according to their respective levels of mobility and accessibility, with those roads providing greatest mobility conversely providing the least accessibility.
  • It is on the applicable classification level that the design of the road is based.

Geometric Design

  • The objective in Geometric design is to promote efficiency and safety.
  • It is divided into three main parts – alignment, longitudinal profile, and cross-section
    • Alignment is not only the route of the road, but also the provision made for intersections and the like
    • Longitudinal profile presents the vertical aspect of the road, including the crests and valleys, and the grade lines connecting them
    • Cross section covers the position and number of vehicle lanes, bicycle lanes and sidewalks, along with their cross-falls or cambers

Pavement Design

  • Pavement design is intended to provide the most cost-effective pavement structure whilst optimizing the level of service provided to road users
  • It takes account of:
    • Soil Support (subgrade) factors
    • Traffic factors, such as vehicle types, loading and frequency
    • Regional factors
    • Serviceability factors

Wearing Surface

  • The wearing surface of a road is normally, but not always, one that is:
    • Impervious to the ingress of water
    • Has an even running surface
    • Is durable
    • Has a high skidding resistance

Road Marking, Road Signage and Signals

  • Road signs, signals and markings are important components of road safety. They:
    • regulate the safe flow of traffic
    • warn motorists of the conditions on the road ahead
    • provide information
    • give guidance about routes and destinations.

Selected Projects:

  • National Route 1, Section 16, Main Road Rehabilitation, Free State
  • Beit St, Upper Ross St, Staib St, Park St, 4th St and Central Square
  • Crownwood Rd, JHB
  • Saratoga Avenue Upgrading for Bus Rapid Transit Routes
  • Fuller St, Appolonia St, Miller St, Voorhout St, Andries St, Gous St, Overberg St and Verwey St
  • Ekurhuleni Eastern Region Roads Rehabilitation
  • Smit & Wolmarans Streets Upgrading for Bus Rapid Transit Routes
  • Curry St, Staib St, Upper Railway St and Ove St
  • Tembisa Roads Upgrading, Kempton Park / Tembisa
  • Tunney Roads and Stormwater Management, Germiston
  • National Route 11 (N11), Middelburg to Ermelo, Catchment Analysis & Rehabilitation of 9 Bridges
  • Siemert Ave and Sivewright St Upgrading
  • Duduza Roads Upgrading, Nigel
  • Ormonde Roads and Stormwater Drainage
  • Rietfontein Access Road
  • Orlando West Roads and Stormwater Drainage
  • Devon & Impumelelo Roads Upgrading, Eastern Gauteng
  • Ivory Park Subsoil Drainage, Midrand
  • Tsakane Distributor Roads, Brakpan



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