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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

Well-established root system important for sustainable production in semi-arid grasslands
2015-02-24

Plot layout where production and root studies were done
Photo: Supplied

The importance of a well-established root system for sustainable production in the semi-arid grasslands cannot be over-emphasised.

A study of Prof Hennie Snyman from the Department of Animal and Wildlife and Grassland Sciences at the University of the Free State is of the few studies in which soil-water instead of rainfall has been used to estimate above- and below-ground production of semi-arid grasslands. “In the past, plant ecological studies have concentrated largely on above-ground parts of the grassland ecosystem with less emphasis on root growth. This study is, therefore, one of the few done on root dynamics in drier areas,” said Prof Snyman.

The longevity of grass seeds in the soil seed bank is another aspect that is being investigated at present. This information could provide guidelines in grassland restoration.

“Understanding changes in the hydrological characteristics of grassland ecosystems with degradation is essential when making grassland management decisions in arid and semi-arid areas to ensure sustainable animal production. The impact of grassland degradation on productivity, root production, root/shoot ratios, and water-use efficiency has been quantified for the semi-arid grasslands over the last 35 years. Because of the great impact of sustainable management guidelines on land users, this study will be continuing for many years,” said Prof Snyman.

Water-use efficiency (WUE) is defined as the quantity of above- and/or below-ground plant produced over a given period of time per unit of water evapotranspired. Sampling is done from grassland artificially maintained in three different grassland conditions: good, moderate, and poor.

As much as 86, 89 and 94% of the roots for grasslands in good, moderate and poor conditions respectively occur at a depth of less than 300 mm. Root mass is strongly seasonal with the most active growth taking place during March and April. Root mass appears to be greater than above-ground production for these semi-arid areas, with an increase in roots in relation to above-ground production with grassland degradation. The mean monthly root/shoot ratios for grasslands in good, moderate, and poor conditions are 1.16, 1.11, and 1.37 respectively. Grassland degradation lowered above- and below-ground plant production significantly as well as water-use efficiency. The mean WUE (root production included) was 4.79, 3.54 and 2.47 kg ha -1 mm -1 for grasslands in good, moderate, and poor conditions respectively.

These water-use efficiency observations are among the few that also include root production in their calculations.

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