Excavations adjacent to roads
The most heavily stressed area of a road is usually the inside wheel track adjacent to the road edge. Depending on ground conditions, it is often necessary to support the road edge by providing lateral restraint within the adjoining footway, footpath, cycle track or verge. The most common form of edge support is a section of unbound or CBGM base material. This construction will most commonly be encountered when the horizontal distance between the edge of the undertakers’ excavation and the edge of the road surface is less than the expected depth of cover of the undertakers’ apparatus.