Relationships between Centrifugal Force, Permissible Driving Speed, Outside Diameter, Circular Lane Width and Transverse Gradient of the Seven Selected Austrian Roundabouts

Kerim Hrapović

Kerim Hrapović

Keywords: asphalt, bitumen, centrifugal force, circular lane width, outside diameter, permissible driving speed, roundabout

Abstract

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 tyres 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. It can be stated that there is a correlation between the centrifugal force acting on the vehicle when driving through a roundabout, the permissible driving speed, the outer diameter, the circular lane width and the transversal gradient of the circular lane at roundabout.

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