Read Journals 1793 – Vol 67 No 3 – Roundabout capacity in South Africa
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Gap acceptance and follow-up times are critical parameters in determining the capacity of roundabouts. A major national research project was undertaken by the South African National Roads Agency Ltd (SANRAL) into the design, capacity and operations of roundabouts. This paper provides an overview of the findings and presents the models that were developed to inform the capacity analysis of roundabouts in South Africa. Three important aspects of capacity are addressed, namely i) critical gap acceptance, ii) saturation follow-up headways, and ii) capacity, models. The research was based on data collected using drone video recordings at a total of about 90 roundabouts across the country.
Keywords: Roundabout capacity gap acceptance
