This article is devoted to the development of a joint filler for cracks in asphalt concrete pavement, as well as for expansion joints in cement concrete pavement. The article presents the choice of unified units and units of the joint
filler unit being developed for cracks in asphalt concrete pavement and for expansion joints in cement concrete pavement. Some methods for calculating the main parameters of the created joint filler are presented. In addition, a
suitable prototype of a joint filler, cracks in the asphalt concrete pavement and expansion joints in the cement concrete pavement were selected from several types.