Roads

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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

Transportation
Rail
Bridges
Airports

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