Typical Section

Figure 3-6.—Typical section. configuration of the completed road should be. You will the type and thickness of the base and surface materials, also use sections for staking out roads, for determining earthwork requirements, and for determining how closely the completed road conforms to its original design. Typical Section In the construction of a road, certain conditions or requirements must be met. One requirement is that the shape and features of the road be as uniform as possible. This and other requirements are stipulated in the typical section for the road. (See fig. 3-6.) The typical section of a road shows exactly what the road should look like after it is constructed. It includes the crown, superelevation, ditch slope, cut slope, fill slope, and all horizontal widths of components, such as surface, shoulders, and ditches. Since slight deviations will occur during construction, a tolerance in construction is allowed. However, the shape and construction of the road should conform as closely as possible to the typical section. (For general provisions and design criteria, refer to NAVFAC DM-5.5.) Typical sections are prepared for both straight and curved portions of the road. The typical section for a curved portion of a road differs from the straight portion in that the shape of the roadbed is different. In a typical 3-8