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How to can a user incorporate different surface types in flexible pavement design using PAVEXpress?

PAVEXpress follows 1993 AASHTO Pavement Design and allows up to three different asphalt layers. Each material used in a layer is defined by the layer coefficient. Therefore, if a new surface material is used, then a different layer coefficient is entered. Unless a non-standard layer coefficient is used, then PAVEXpress does not differientate between materials.