The construction of rigid pavements is a mainly specialist job, often requiring complex and expensive laying machinery. The pavement quality concrete replaces the surface course, binder course and base of flexible and flexible composite roads. Increasing volume and weight of traffic have caused designers to increase the strength of pavement surface concrete to provide greater durability in order to offset the resulting wear. The strength of the pavement-quality concrete is measured by the crushing strength of 150 mm concrete cubes. The rigid pavement is divided into individual panels by joints in both the longitudinal and transverse directions, except in the case of continuously reinforced concrete pavements which have only longitudinal joints, if they are 6 m width or over. Manhole covers, gullies and their frames must be isolated from the main pavement slab and be housed in ‘localized’ slabs, which must be larger than the manhole shaft, gully grid or gully.