Wolvercote Viaduct carries the A34 dual carriageway trunk road (Oxford Western Bypass) over the River Thames flood plain, the Oxford to Birmingham main line railway, the Oxford Canal and the A40 Oxford to Cheltenham road.

In the first phase of work, a temporary southbound bridge deck will be built to the east of the existing viaduct so traffic can be diverted onto this whilst the new viaduct is built.

During this first phase, other than some overnight closures, two narrower lanes for 500m in both directions, will be kept open during the day on the A34 for the duration of the scheme. A 40mph speed limit, enforced by average speed safety cameras, will be in place for the protection of road users and road workers.

The A40 that runs under the viaduct will have a narrower lane running in each direction with a 30mph speed limit and off peak temporary traffic lights at times. There will also be a temporary diversion of footpath and cycle-way.

The work will be completed in a number of phases with the first phase planned to finish in spring 2009.

The new viaduct is scheduled to be completed in 2010.