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Upper surfacing layer formed by bituminous mixtures.
The surfacing is also the upper layer of the pavement that positioned on the base, directly supports the traffic's requests.
The carriageway's superficial qualities depend on the correct selection and construction of the surfacing which are classed as:
- Superficial regularity: lack of dislevelment or longitudinal and transversal ripples.
- Superficial texture: gives resistance to slippage.
- Waterproofing: stops the penetration of water to the lower layers of the pavement and formation level.