Selection of pavement based on environmental conditions

When a significant noise impactimpacts mustare be achieved,needed, the use of an SDA 4 surface is generally recommended. Particularly due to its advantageous noise-reducing properties towards the end of its service life. Therefore, even with high traffic volumes and larger proportions of heavy traffic, the SDA 4 is preferred over SDA 8 and AC 8.8 LA. If lower noise impacts needare todeemed be achieved,adequate, SDA 8 or AC 8 LA can be installed.

Under the following specific environmental conditions, the choice of surface must be examined in more detail and, if necessary, more robust variants such as SDA 8 or AC 8 LA should be used to ensure sufficient resilience and avoid a reduction in lifespan:

• for traffic class T5 and higher,
• for traffic areas with higherirregular mechanical stress, such as due to tight curve radii,
• for aslope gradientgradients greater than 8%,
• at elevations of about 700-800 m above sea level or higher, 
• roadfrequent stops,stopping areas,
• artificial structures structures.

To avoid accelerated texture deterioration of the surface,surface texture, the use of SDA 4 should also be carefully considered in the following situations with particularly high mechanical stress:

• when using snow chains,
• when using spikes,
• in cases of strong shear forces at junctions,
• in intersection areas,intersections,
• whenareas with turning heavy vehiclesvehicles.

On road sections with bus lines and a high proportion of trucks, the use of AC 8 and AC 8 LA surfaces should be avoided. The very fine surface texture of these surfaces can lead to a disturbing whistling noise when driven on with wide tires, especially with rubberized tires, as is common with buses and trucks.