The Highways Agency said it decided to keep the Boston Manor Viaduct closed because during works it found a crack in a "sensitive location", which requires it to be kept closed until it is repaired.
Diversion on the A312 and the A4. Drivers are being advised to allow extra time for their journeys.
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Doctors have recommend Peter Sutcliffe be moved to high security prison, but the final decision will be taken by the justice secretary.
An investigation has seen four men jailed for a total of more than 17 years after importing more than 60kg of cannabis resin.
Tuesday morning's weather for the west of the region