§ Mr. David MarshallTo ask the Secretary of State for Transport what is the cost per mile for(a) porous asphalt road surface material and (b) concrete surfaces for (i) single carriageway road, (ii) two-lane dual carriageway roads, (iii) three-lane dual carriageway roads and (iv) four-lane dual carriageway roads.
§ Mr. KeyThe approximate costs per mile of surfacing the various standards of road are shown in the table:
£k Porous asphalt Typical concrete road Single carriageway 90 450 2 Iane dual—all purpose 180 900 —motorway 220 1,100 3 Iane dual—all purpose 250 1,260 —motorway 275 1,380 4 Iane dual—all purpose — — —motorway 345 1,750 These figures are indicative only because both site and choice of pavement design will cause them to vary. Further, the figures for porous asphalt are based on limited experience.
§ Mr. David MarshallTo ask the Secretary of State for Transport what are the average costs of constructing one mile of dual three lane motorway(a) in a tunnel and (b) on the surface.
§ Mr. KeyThe cost of building roads and tunnels varies considerably dependent upon location, topography and ground conditions. At current prices the average total cost of building one mile of dual three-lane motorway on the surface would be between £6 million and £10 million. Building the same length in tunnel would probably cost at least £60 million and possibly as much as £150 million.