Good performance increase productivity in the construction projects and it contribute positively to the growth of the South African Economy. The aim of the paper was to investigate the impacts of poor performance on roads infrastructure projects in the Gauteng Province. Questionnaires were distributed to various construction firms which were registered with South African approved council bodies and also with construction industry development board. The questionnaires were sent via emails and dispersed during site and briefing meeting for contractors. 76 out of 100 questionnaires were collected and were used for the study. Random sampling method was used. Research findings revealed that loss of productivity; Cost overrun; disease outbreak; Time overrun; Environmental impact; Conflicts; Disputes between owner and contractor; Loss of skilled workers; stress on the contractor; Reworks were the major impacts on the construction of road infrastructure, in the South African Construction industry. Therefore, cost overrun, and time overruns can be avoided by limiting change and variation orders. In addition, skills transfer is needed so that skilled workers can pass the knowledge to the new manpower before they retired. Poor performance creates stress on the contractor as the contractor will experience the problems such as reworks, termination of contract, and default on loan repayment by the contractor.
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