Samples are being taken to find out why reinforced concrete on the A53 flyover at Etruria is crumbling - but it could be two weeks before results are known.
The road has been closed for more than 3 weeks, after what was initially thought to be a pothole revealed issues around a bridge joint.
A city council spokesman said: “We thank motorists for their continued patience while we work to get the flyover reopened as quickly as possible.
"We’re pleased to say that weather permitting we will complete a ‘principal inspection’ of the entire bridge by the end of the day. This has involved close inspection of every detail of the structure. These are programmed every six years with the next one due in 2020, but we have used this opportunity to bring it forward so next year’s planned closure should not be needed which is some good news.
“We are set to appoint a specialist contractor to test the concrete and find the cause of the failure. This will also be done by the end of today.
"Several samples will then be taken from the bridge’s concrete deck and sent to a laboratory for analysis to determine the cause and extent of any deterioration.
"Taking the samples is a fairly quick process, but it can take two weeks for the results to come back from the laboratory.”