Fast cars and wideboys

The undulating stretch between junctions 25 and 28 on the M1 has always been a bottleneck and has long been earmarked for improvement by the Highways Agency. The aim is to widen both the northbound and the southbound carriageways between the junctions from three lanes to four lanes. A few metres from the toe of the existing cutting have been taken, steepening the batter to create the required extra space. This procedure can leave the new face dangerously unstable, so following geo-technical investigations it was decided to install 5000 soil nails to stabilise the slope. In some places the underlying rock was strong enough to stand alone and the nails were not required there after all. The procedure of inserting the nails is described in detail, and a description of how the widening was delivered appears in an inset. The project box explains details of the scheme including contractors and costs.


  • English

Media Info

  • Pagination: 13-15
  • Serial:
    • Volume: 42
    • Issue Number: 4
    • ISSN: 0017-4653

Subject/Index Terms

Filing Info

  • Accession Number: 01146970
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Dec 24 2009 8:33AM