Jacobs was commissioned by Oxfordshire County Council (OCC) to undertake a Watching Brief on works along the A420 High Street, Oxford. The work was undertaken in two phases. The first phase, in August 2006, was between Carfax Tower and the junction of Turl Street and St Alfred's Street. The second phase, between the junction with Longwall Street and Magdalen Bridge, was undertaken in January and February 2007. No archaeological remains or deposits were identified in the first phase of work. A stone built culvert and associated road surface probably dating to the 1778 highway improvements were identified during the second phase of works. The work was undertaken by Jacobs, with additional services provided by Oxford Archaeology and DBI Environmental Services Ltd.