Continuously reinforced pavement is pavement in which the continuity of the longitudinal reinforcing steel is interrupted only at structures or at the ends of the projects. There are no transverse joints other than construction joints and expansion joints at structures. The whole idea of continuously reinforced pavement is based essentially on the "so let is crack" philosophy rather than the fussy concept of avoiding cracks at any price. The important difference, however, is that a continuously reinforced pavement is designed to keep the cracks tightly closed so that the slab will retain its structural integrity. In an unreinforced slab cracks which occur will normally widen and get progressively worse under the effects of traffic and climatic conditions. Fortunately, the amount of reinforcement needed to control the cracking is relatively low if the length of the slab is short. But as the length of the slab increases the amount of steel needed also increases. This is the main reason why the length of conventional slabs has always stayed within 40 to 100 feet. It has simply proved more economical from a first cost standpoint. However, the steel is not directly proportional to the slab length as is usually assumed in the design of conventional jointed reinforced pavement. As a matter of fact, the relationship is a parabolic function with the steel increasing at a progressively decreasing rate as the slab length increases and reaching a maximum at slab length of 600 to 800 feet. It has also been found that as the amount of steel in the slab is increased, the number of cracks also increases. Theoretically, this is highly desirable because it means that stresses due to any cause will be distributed more evenly among the cracks and no single crack will then show a tendency to open excessively. An excessive number of cracks has no real influence on the structural efficiency of the slab. The design, therefore, should include only the optimum amount of steel that will (1) cause sufficient cracks to occur and (2) ensure that they will remain tightly closed under service.