Definition of roadbed in English:



  • 1The material laid down to form a road.

    • ‘Culverts - metal, plastic or concrete pipes installed under roadbeds to channel runoff - are not always the best solution for drainage, but they are common and sometimes necessary.’
    • ‘Add such attachments as scarifiers, and graders can even tear up old roadbeds.’
    • ‘Extant contracts do not give information about the profile of the roadbed except that it was not to be below the level of the adjacent ground.’
    • ‘A minority of these roads, although listed with a carriageway of constant thickness, may have had a similar surface profile, provided the roadbed on which they were formed had a central camber.’
    • ‘Concrete from the demolition of the site's previous buildings was reused in roadbeds.’
    • ‘They begin beneath the roadbed where subsurface water meets the advancing frost line and forms a layer of ice, called a lens.’
    1. 1.1North American The part of a road on which vehicles travel.
      • ‘As the water drops, submerged trees, rocks, even old roadbeds break the surface or, worse, lurk just below it, waiting to bust a prop or bend a shaft.’
      • ‘Sections of the roadbed where erosion and poor landscaping along steep grades create a safety concern will also be reinforced or shored-up.’
      • ‘The total area of land being acquired is 141.26 Ha, consisting of 122.42 Ha agricultural land, 10.32 Ha forestry and 8.52 Ha of roadbed.’
      • ‘Because the melted water cannot drain into the frozen subsoil, the upper lifts of a roadbed become saturated and the road's load bearing capacity is greatly reduced.’
      • ‘Shade helps protect the road from drying out in times of low precipitation; roots stabilize the roadbed.’
      • ‘Officials said that three storms in the last two months collapsed roads and destroyed roadbeds in the park.’
      • ‘The board said it believes someone crept down to the dusty roadbed after the last vehicle went by and dug in a mine to catch the next passing vehicle.’
      • ‘On our left, a sheering ledge cut off the roadbed.’
      • ‘These carefully concealed elevators, built within the highway tunnels located in Portland's West Hills, will have the capacity to lift both vehicles and helicopters to the highway roadbed.’
      • ‘Road damage starts when buses and other heavy vehicles over a certain weight threshold cause the roadbed to flex and crack.’
      • ‘Petroleum emulsions work for dust suppression, particularly on dirt roadbeds and shoulders in arid areas.’
      • ‘Repairs are now underway on the roadbed where the pipe burst.’
      • ‘The roadbed looked like it was made from rectangular white building stones, grouted together carefully, that had been grossly discolored.’
    2. 1.2
      another term for trackbed
      • ‘This marker also stands on the abandoned roadbed of the St. Paul and Southern Railway.’
      • ‘The men who built this railway had to hang suspended by ropes from vertical cliffs, blasting and hacking out a roadbed.’