The rolling process is a tyre/road interaction, with the following implications which are important for the performance and the construction of the tyres and the road surfaces:1. There must be a good contact between tyre and road surface. 2.Longitudinal forces for powering the rolling, side forces for keeping the tyre on track and forces for braking must be transferred in the tyre/road interface.3. To prevent water from separating the tyre from the road, the tyre tread and the road surface must both have a drainage capacity; i.e. the tyre must have a suitable tread pattern and the road surface must have a certain texture. Air and water in the contact area 4. must be transported away from it at extremely high speeds. 5. For the best molecular contact, the tyre tread must be able to envelop a reasonable part of the road surface texture.6. Durability requirements give restrictions on material, tread pattern and road surface texture.
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