Current situation in road design practice show that there exist inconsistency in using and defining some asphalt material parameters. Such inconsistence leads from fact of introducing EU standards for materials while design methods leaving unchanged. In order to found possibilities adapt the correct modern test methods for asphalt material parameters such as deformation modulus used in road pavement design procedures, the research and theoretical basement analysis was performed. Current research fixes that after introducing of EU standards for road material requirements instead of former GOST, road engineers were faced with fact, that EU materials no more conforms with former design procedure. Some of them starts using other design methods different from previously used GOST based VSN (Russian) pavement design procedure. However both practices have not been covered with appropriate design parameters applicable for used procedures. Main source of inconsistency as fixed is non-compliance of defined road pavement materials with parameters used in design procedures and, for instance, defined on GOST basement. As result it leads to the improperly designed pavement structures and possibly can result in significant looses for national road industry. This paper presents the interpretation of four point bending test results and possibility of acceptance for use them in still mostly used pavement design procedure -VSN. Four point bending tests were performed on AC11 asphalt mixture with conventional (dolomite, quartz sand) and non conventional (steel slag, dolomite sand) aggregates.