While driving through the roundabout, the thrust and frictional forces act on the asphalt pavement of the roundabout through the contact between the vehicle tires and the roundabout pavement. The circular roadways at roundabouts are exposed to special traffic loads due to cornering, namely friction and shear stresses, and in smaller roundabouts (mini roundabouts) also torsional stresses (turning of tires on the spot). Especially due to the high proportion of heavy traffic, damage to the asphalt pavement is often found, such as cracks, unevenness (indentations, ruts), etc.

Therefore, it is extremely important to counteract the development of asphalt road damage by selecting the right asphalt construction for the roundabout pavements. In order to avoid possible under dimensioning, it is recommended to generally choose the next higher load class – deviating from the RStOs (guidelines for standardization of pavements of traffic surfaces (GER)) in relation to the most heavily loaded section of the roundabout.