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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

Mineral named after UFS professor
2017-09-29

Description: Mineral tredoux Tags: International Mineralogical Association, tredouxite, Prof Marian Tredoux, Department of Geology, Barberton 

Tredouxite (white) intergrown with bottinoite (light grey),
a complex hydrous alteration product. The large host
minerals are nickel-rich silicate (grey), maybe willemseite,
and the spinel trevorite (dark grey).


More than five thousand minerals have been certified by the International Mineralogical Association (IMA). One of these minerals, tredouxite, was recently named after an academic at the University of the Free State (UFS). 

Tredouxite was named after Prof Marian Tredoux, an associate professor in the Department of Geology, to acknowledge her close to 30 years’ commitment to figuring out the geological history of the rock in which this mineral occurs. The name was chosen by the team which identified the new mineral, consisting of Dr Federica Zaccarini and Prof. Giorgio Garuti from the University of Leoben, Austria, Prof. Luca Bindi from the University of Florence, Italy, and Prof. Duncan Miller from the UFS. 

They found the mineral in the abovementioned rock from the Barberton region in Mpumalanga, in May 2017.

In the past, a mineral was also named after Marie Curie
With the exception of a few historical (pre-1800) names, a mineral is typically named either after the area where it was first found, or after its chemical composition or physical properties, or after a person. If named after a person, it has to be someone who had nothing to do with finding the mineral.

Prof Tredoux said: “As of 19 September 2017, 5292 minerals had been certified by IMA. Of these, 81 were named after women, either singly or with a near relation. Marie Curie is named twice: sklodowskite (herself) and curite (plus husband). Most of the named women are Russian geoscientists.”

Another way to assess the rarity of such a naming is to consider that fewer than 700 minerals have been named after people. Given that there are by now seven billion people on the planet, it means that a person who is granted a mineral name becomes one in 10 million of the people alive today to be honoured in such a way. To date, over a dozen minerals had been named after South Africans, three of them after women (including tredouxite).

It contains nickel, antimony and oxygen
The chemical composition of tredouxite is NiSb2O6 (nickel antimony oxide). This makes it the nickel equivalent of the magnesium mineral bystromite (MgSb2O6), described in the 1950s from the La Fortuna antimony mine in Mexico.  

“This announcement is of great academic importance: the discovery by the Italian team of a phase with that specific chemical composition will undoubtedly help me and my co-workers to better understand the origin of the rock itself,” she said. She also expressed the hope that it may raise interest in the Department of Geology and the UFS as a whole, by highlighting that world-class research is being done at the department. 

The announcement of this new mineral was published on the International Mineralogical Association Commission on New Minerals, Nomenclature and Classification website, the Mineralogical Magazine and the European Journal of Mineralogy.

 

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