Cost and Schedule Assessment for Emergency Refuges and Hard Shoulder in A303 Stonehenge Tunnel

About

Highways England awarded a contract to Benchmark Estimating for an assessment of the incremental cost and schedule impacts of adding emergency refuges or a hard shoulder within the A303 Stonehenge tunnel.

The assessment considered two options: two lay-bys per tunnel spaced at 1000m centres (four in total) using SCL techniques, and increasing tunnel diameter to incorporate a hard shoulder lane over the entire length.

The work involved establishing a baseline estimate and schedule, developing design and methodology assumptions in consultation with the A303 Stonehenge project team, and producing cost estimates and outline schedules for each option.

The contract value was £18,813.