Transport for London has closed the A4 Hammersmith Flyover with immediate effect after detecting a structural problem.
The flyover will be closed until january at least, as TfL contractors work to make the structure safe.
The flyover was built in 1962, and its structure was already the subject of a TfL monitoring programme, as it was known to be degrading. However, an inpection as part of that programme this week revealed more serious degradation, and forced the closure.
If major repair is required for the flyover, it will cause extensive and costly congestion around a key transport interchange. See more detailed coverage from New Civil Engineer.