In LVUP (Light Vehicular Underpass) structures and MNB (Minor Bridge) structures, soil is filled on all four sides to provide stability and support. However, due to water infiltration, the soil gradually settles, leading to uneven road surfaces that can cause accidents and disrupt smooth vehicular movement. This issue poses a significant challenge in ensuring long-term road safety and durability. To counter this, the apron slab structure is constructed around the LVUP and MNB structures, preventing soil erosion and maintaining a level road surface. By reinforcing the edges, the apron slab ensures that the roadway remains intact, reducing maintenance costs and enhancing the lifespan of the expressway. Given India’s diverse climatic conditions and high traffic density, the inclusion of apron slab structures in projects like the Delhi-Katra Expressway (DAK PKG-14) is crucial for ensuring road safety, structural integrity, and uninterrupted transportation.

How Apron Slabs Support High-Speed Traffic on the Delhi-Katra Expressway

The apron slab structure is constructed at the top level on all four sides of LVUP and MNB structures to prevent soil settlement and road surface deterioration. During construction, a bracket plate is pre-installed, ensuring that the apron slab remains 100mm above the structure. This design prevents the road surface from becoming uneven due to soil erosion, enhancing stability and durability. In major projects like the Delhi-Katra Expressway (DAK PKG-14), apron slabs play a vital role in ensuring safe and long-lasting roads in India.