Road retaining wall design refers to the engineering and construction techniques used to create walls that support or retain soil and prevent erosion. These walls are commonly used in road construction to prevent landslides and to create level surfaces for roads. The design involves considerations such as soil properties, wall materials, stability analysis, and structural design. Factors like the slope of the ground, the type of soil, and the expected load must be taken into account to ensure the wall's structural integrity and longevity.