HOCHTIEF delivered improvements to Junction 16 of the M4, a major strategic link, which carries over 5,500 vehicles per hour at peak times. Our works included widening slip roads, reconfiguring the roundabout and adding a signalised junction to improve traffic flows and increase capacity to support a major housing development.

Key features:

  • Roundabout reconfiguration
  • Slip road widening
  • Signalised junction
  • Drainage
  • Traffic signals
  • Utilities diversions.

Using carefully phased Traffic Management, we sequentially reconfigured the road layout to minimise lane closures and maintain traffic flows. We worked concurrently on multiple areas to maximise efficiency and completed the most disruptive works, including surfacing, during off-peak hours.

By completing works right first time – such as the surface course on the eastbound slip road, which was delivered during a weekday night closure – we avoided delays and kept the programme on track. We also reduced lane speeds to 40mph to enable us to use cones instead of barriers in most areas, maximising efficiency as cones can be set out and removed quickly. This saved three weeks on the programme.

Working collaboratively with Swindon Borough Council, we planned routes for deliveries that avoided the M4, Swindon, and a local town, to minimise disruption to the road network. Our effective logistics planning enabled us to transport over 80,000 tonnes of imported clay to site with minimal impact on traffic in the surrounding area. We continually monitored traffic volumes to check that our works were not negatively impacting local residents, businesses and commuters. The new layout was brought into use in May 2018.