Alternative highway

Alternative road, 5.50 kilometres long, each carriageway is 7 m wide, with an outer lane of 2.5 m, an inside stretch of 1 m, an emergency lane of 0.5 m and a 10-m median strip.

The section has 9 1,800-mm cross drainage works, 15 at 600 mm, a 400-mm sewer 10.7 km in length, and 21 km of lined gutters. The volumes of earthworks are distributed as follows: 390,000 m3 excavation, 150,000 m3 fill, 520,000 m3 borrowed fill.


The section has an underpass and a junction at the end of the section with the intersection of SE/425 made up of a two-span overpass with a prestressed deck and two roundabouts with entry and exit lanes to the main road.


  • Location: Seville, Spain.
  • Contract type: Construction.
  • Infrastructure: Highway in an alternate layout with a length of 5,578 m. Each carriageway is 7 m wide with a 2.5 m outside lane, a 1 m inside stretch and 0.5-m berms. The median is 10 m wide. The pavement for T1 traffic consists of 120 cm of S3 selected soil (300,000 m3), 28 cm of artificial aggregate (70,000 m3), and 26 cm of agglomerate (80,000 t).
  • Year of project completion: 2005


As additional works and as an alternative layout, included:

  • The replacement of the Huesna Consortium water conduit, encased in a 900-mm diameter steel casing.
  • A total of 9 sections of private electrical lines were replaced, as well as medium-voltage lines, overhead and fibre optic telephone lines and a junction with a high-speed line.
  • A natural gas pipeline and a CLH oil pipeline also cross the site.


As corrective environmental measures, the project included noise barriers, topsoil on embankments and transplantation of olive trees. The enclosure consisted of chain-link wire-mesh fencing with 2-m high livestock fencing outside the service roads. Vertical and horizontal signposting and drovers' road and property boundary posts.

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