Bridge works cause further delays at Milton Park
Work to improve access to an Oxfordshire business park will continue longer than expected after problems with the road structure were uncovered.
A new road bridge being installed over the railway between the A34 and Milton Park had been due to open in February.
Network Rail said the approach roads are also in need of major repairs, which could continue until July.
The road has been closed since October 2010, causing considerable delays to people working in the business park.
The latest round of work will involve installing piles to strengthen the road.
The resulting traffic jams have been causing frustration for many of the park's 6,500 commuters. One driver told the BBC it has been taking her more than 45 minutes to complete the final three miles of her journey to work.
MEPC, which owns the business park, said on its website that it was "disappointed and surprised" at the announcement, describing the delay was "wholly unacceptable".
The scheme has already been delayed by the weather in December, when it was too cold for contractors to pour concrete.
A Network Rail spokesman said: "We apologise wholeheartedly for the disruption this delay will cause to people's journeys and we're working hard to ensure the work is completed as quickly as possible."
Oxfordshire County Council's growth and infrastructure councillor Ian Hudspeth said: "We recognise the ongoing impact this project is having on traffic getting in and out of the business park.
"We are working closely with Network Rail and the Highways Agency to look at what might be possible in terms of finding a solution to decrease traffic delays within Milton Park without impacting on the wider road network."