M11 Junctions 8-9

Maintenance M11 Junctions 8-9

Facts and figures

  • Part of the Highways Agency’s South East Framework for Highways in Area 8
  • £6.3m over a three-month contract period
  • Covering a 4km stretch of dual carriageway with a daily average of 33,000 vehicles in each direction
  • First project in Essex to use average speed cameras
  • Shared risk with key supply chain partners
  • Secondment of staff to key supply chain partners to aid programme delivery
  • No adverse environmental incidents
  • Close liaison with Essex and Cambridgeshire constabularies
  • Recycling of existing concrete as sub-base material
  • Deliveries management minimised disruption to local businesses

Interserve was the principal contractor working on behalf of the Highways Agency for the resurfacing and repair works on Phase 2 of the project, located on the northbound and southbound carriageways of the M11 between junctions 8 and 9.

Early Contractor Involvement and a ‘right first time’ philosophy resulted in time and cost savings and minimum disruption to road users and the local community.

Interserve was appointed during the design stage to advise on programme, buildability, traffic management, selection of construction materials and budget. The project involved the part-demolition of the existing carriageway through crack and seat rehabilitation measures and major maintenance re-surfacing works to the main carriageway. There was also a small element of permanent works design, the design of temporary works and traffic management layouts. Other new works included the slip-forming of a central reserve concrete barrier and trapezoidal drainage channel.

Achievements

  • Interserve’s traffic management strategy minimised closure periods of slip roads, which contributed to a 33 per cent reduction in the construction period and a £200,000 cost reduction - with no significant increase in traffic delays. It also helped local businesses
  • The scheme objectives were fully complied with and the contract was completed on time to an agreed contract programme and target cost
  • Through a re-alignment of drainage details adjacent to the Central Reserve Barrier, the Interserve team enabled a standard barrier solution to be used. This provided a significant cost reduction compared to the proposed variable profile barrier that would otherwise have been required
  • High customer satisfaction rating based on 31 KPIs. Testimonials received from the public