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.
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