What is the purpose of a slope stake in highway construction?

The purpose of a slope stake in highway construction is to indicate where the design slope intersects with the ground. Slope stakes are essential for guiding the grading crew as they cut or fill earth to achieve the desired slope defined in the construction plans. By marking the points at which the theoretical design surfaces meet the existing terrain, slope stakes help ensure that the roadbed will be constructed with the appropriate cross-sectional shape and elevation. This is crucial not only for the integrity and safety of the roadway but also for proper drainage and stabilization.

The indication provided by slope stakes allows surveyors and construction personnel to maintain consistency with the engineered slopes, which are designed to control water runoff, prevent erosion, and enhance the overall performance of the highway infrastructure. Proper placement of these slopes is vital to avoid future maintenance issues and ensure the roadway's longevity.