This book describes my studies on problems at the design stage of the roads and bridges and offers some reasonable solutions for them: one of the major problem acting on the road surface and bridge construction is impact of the water, where are offered a couple of design solutions; also in the book are found new technologies for preparing the asphalt mixture; and study of the bridge joint devices at concrete construction of bridges. The implementation of the proposed solutions leads to a lower price and longer durability of the road and bridge constructions.