A traffic circle can use stop signs and other controls. There are also no limits to the circle size or the entrance angles and widths of the approaches.
A modern roundabout only uses yield control on approaches. Roundabouts also have design limits on circle size and the approach entry designs.
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Although a multi-lane roundabout has two or more lanes, drivers should not change lanes while travelling in the roundabout. The traffic signs are designed to guide drivers to the correct lane before entering the roundabout and while circling the roundabout. If a driver does not choose the correct lane, then he or she should exit the roundabout, make a u-turn at the next median break and choose the correct lane based on the traffic signs. Changing lanes within a roundabout not only causes confusion for other drivers, but can also cause accidents.
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Many roundabouts are designed to allow buses and large trucks to drive through the roundabout. They typically have a 5-15 foot wide mountable curb around the central island called a truck apron. Buses and semi-trucks can use this apron in order to make a turn within the roundabout, and for multi-lane roundabouts, they can use both circulating lanes in order to make a turn. However, drivers of large vehicles need to wait until the circulating roundabout is clear of vehicles before they can enter and use both lanes. In addition, drivers on multi-lane approaches to roundabouts need to give way to oversized vehicles and allow them to enter the roundabout first.