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03 February 2020 | Story Cobus van Jaarsveld | Photo Charl Devenish
Traffic Circle on the UFS Bloemfontein Campus
The Department of Protection Services shares how to #BSafe at traffic circles.

For the majority of drivers, one of the most confusing driving laws is the correct use of a traffic circle, especially in Bloemfontein with the large number of smaller traffic circles constructed over the past few years; also across the University of the Free State (UFS) Bloemfontein Campus.

“In fact, many motorists do not know that there is a difference between a larger traffic circle and a mini traffic circle, other than their size. Can you really be frustrated if someone cuts you off at a traffic circle if you don't know the rules? Arrive Alive has shed some light on the issue,” said Cobus van Jaarsveld, Assistant Director: Threat Detection, Investigations and Liaison in the UFS Department of Protection Services.

What is the difference between the two circles?

A traffic circle is classified as large when it has a minimum diameter of about 16 metres and a 1,5 to 2 metre flattened kerb, which allows heavy vehicles to drive onto a small section of the circle. A mini traffic circle is normally not more than seven to ten metres in diameter and the entire circle is mountable for heavy vehicles.

Are there different rules for each?

Yes – the rule of thumb is that mini traffic circles, which are usually found in residential areas, have the same rules as a four-way stop – first come first served. For larger traffic circles, which are usually found at busy crossings to assist with the traffic flow, you must give way to the right.

Rules to remember at a large traffic circle

As you arrive at a large traffic circle, traffic coming from your right has right of way, regardless of how many cars there are. Wait until there is a gap in the traffic and then ease slowly into the circle. Watch out for other traffic in the circle and be aware that they may not be using their indicators.

Use your indicators

Signal when you are going to turn – switch your indicator on immediately after passing the exit prior to the one you intend taking. If you are taking the first exit, i.e. you're turning left, then flick on your left indicator and keep in the outside/left-hand lane. Keeping in the outside/left-hand lane also works well if you're continuing straight ahead, as your exit is very close. After you've passed the left-turn exit and yours is next, signal left and you're free. If you're turning right or performing a U-turn, keep in the inside/right-hand lane. Only signal left and change into the left-hand lane once you've passed the other exits and only yours is ahead.

Rules to remember at a mini traffic circle

The first vehicle to cross the line has the right of way, so it really works on the same principle as a four-way stop or yield sign. Proceed in a clockwise direction around the circle, without driving on it.

News Archive

Water erosion research help determine future of dams
2017-03-07

Description: Dr Jay le Roux Tags: Dr Jay le Roux

Dr Jay le Roux, one of 31 new NRF-rated
researchers at the University of the Free State,
aims for a higher rating from the NRF.
Photo: Rulanzen Martin

“This rating will motivate me to do more research, to improve outcomes, and to aim for a higher C-rating.” This was the response of Dr Jay le Roux, who was recently graded as an Y2-rated researcher by the National Research Foundation (NRF).

Dr Le Roux, senior lecturer in the Department of Geography at the University of the Free State (UFS), is one of 31 new NRF-rated researchers at the UFS. “This grading will make it possible to focus on more specific research during field research and to come in contact with other experts. Researchers are graded on their potential or contribution in their respective fields,” he said.

Research assess different techniques
His research on water erosion risk in South Africa (SA) is a methodological framework with three hierarchal levels presented. It was done in collaboration with the University of Pretoria (UP), Water Research Commission, Department of Agriculture, Forestry and Fisheries, and recently Rhodes University and the Department of Environmental Affairs. Dr Le Roux was registered for 5 years at UP, while working full-time for the Agricultural Research Council – Institute for Soil, Climate and Water (ARC-ISCW).

Water erosion risk assessment in South Africa: towards a methodological framework
, illustrates the most feasible erosion assessment techniques and input datasets that can be used to map water erosion features in SA. It also emphasises the simplicity required for application at a regional scale, with proper incorporation of the most important erosion-causal factors.

The main feature that distinguishes this approach from previous studies is the fact that this study interprets erosion features as individual sediment sources. Modelling the sediment yield contribution from gully erosion (also known as dongas) with emphasis on connectivity and sediment transport, can be considered as an important step towards the assessment of sediment produce at regional scale. 
 
Dams a pivotal element in river networks

Soil is an important, but limited natural resource in SA. Soil erosion not only involves loss of fertile topsoil and reduction of soil productivity, but is also coupled with serious off-site impacts related to increased mobilisation of sediment and delivery to rivers.

The siltation of dams is a big problem in SA, especially dams that are located in eroded catchment areas. Dr Le Roux recently developed a model to assess sediment yield contribution from gully erosion at a large catchment scale. “The Mzimvubu River Catchment is the only large river network in SA on record without a dam.” The flow and sediment yield in the catchment made it possible to estimate dam life expectancies on between 43 and 55 years for future dams in the area.
 
Future model to assess soil erosion
“I plan to finalise a soil erosion model that will determine the sediment yield of gully erosion on a bigger scale.” It will be useful to determine the lifespan of dams where gully erosion is a big problem. Two of his PhD students are currently working on project proposals to assess soil erosion with the help of remote sensing techniques.

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