n Civil Engineering = Siviele Ingenieurswese - Economic evaluation to determine the viability of solar installations to support traffic signal operations : transportation engineering

Volume 22, Issue 8
  • ISSN : 1021-2000



The City of Johannesburg is one of the largest metropolises in Africa, with more than 2 000 intersections controlled by traffic signals. The Johannesburg Roads Agency (JRA) is responsible for the operation and maintenance of traffic signals on roads that are the property of the City of Johannesburg. When power interruptions occur, the traffic signals are regarded as four-way stops, and the delays at these intersections are then much higher than under normally operating circumstances. The possibility of accidents is also higher and of great concern to the JRA, as acquainted road users might perceive the progression of vehicles ahead as moving due to a 'green' signal, and this has the possibility of rear-end shunts.

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