The most widely used design manual for road pavements is still the Shell manual (Shell, 1978). This is used for mix-design of traditional asphalt pavements considering traffic load and lifetime. Introducing the new generation of pavement functionalities such as low RR without jeopardizing traffic safety through loss of skid resistance requires new design criteria, including knowledge of material behavior in the construction process and in-service life time. To secure correct pavement rehabilitation strategies, robust measurement methods are needed.

The design manual will be developed through laboratory testing of different pavement mixes based on input from WP2 and WP3, using the RR model developed via the WP1–WP2 collaboration. This involves load and durability testing. Low-RR pavements will also be tested by in-situ measurements of the 2012-2014 COOEE test sections, allowing for studies of how low-RR asphalt pavements age. This will be combined with a socio-economic model focusing on RR and its contribution to reduced fuel consumption and emissions (e.g., CO₂/NO_x) to justify the socio-economic benefits of introducing these pavement types in the road infrastructure.