CPSP 143 A303 Stonehenge (Tunnel ERA)

The A303 Stonehenge project has been asked to investigate the impacts of adding emergency refuges or an additional hard shoulder within in the Stonehenge tunnel in order to increase tunnel safety over the 3km bored tunnels. This requires an assessment of the incremental cost and schedule versus the current baseline scheme (D2AP tunnel without refuges or hard shoulder). Two options are to be considered: - The provision of two lay-byes per tunnel, spaced at 1000m centres (four in total), constructed using SCL techniq...