Pavement dwellers refers to Mumbai dwellings built on the footpaths/pavements of city streets. Corpses lay scattered throughout the pavements and streets of Calcutta. Portland cement concrete surface courses are referred to as rigid pavements, or concrete pavements. Many lamps on the pavements of roads are likewise listed. For surfaces like pavements or tarmac base plates are necessary. The council is responsible for the maintenance of Trafford's public roads and pavements. Sealcoating is marketed as a protective coating that extends the life of asphalt pavements. Local limestone may be seen in numerous buildings, walls and pavements throughout Plymouth. It is also hard enough to have been used locally for pavements and kerb-stones. It can also grow from small cracks in pavements and walls. Others dealt with sanitation, fire regulations and upkeep of the city wall, quays and pavements. These areas are known as desert pavements and little further erosion takes place. These include limestone pavements, pot holes, cenotes, caves and gorges. The Mid-levels Escalator consists of twenty escalators and three moving pavements. Mosaic floor pavements of varying types occur throughout the Villa.