Carnell used High Density Array Ground Probing Radar (HDAGPR) surveys during preliminary works on the M11 Birchanger Roundabout Lighting Scheme. As well as providing a safer environment for road workers, the innovation has delivered cost-savings and customer benefits.
As principal contractor on the National Highways scheme, Carnell carried out the renewal of lighting columns, cabling ducting and feeder pillars at the busy M11 Junction 8 Interchange outside Stansted Airport.
As no survey works had been undertaken in advance of the scheme, Carnell used the HDAGPR technique which they pioneered on the SRN. This technology gives more accurate data compared to any other survey method, and located uncharted buried services throughout the roundabout, which was found to be heavily congested with power, traffic signal and communications and cables.