By Alexander Lewis, ABC
Photo: ABC News
Drivers have been stuck in Sydney's M4 tunnel for several hours over fears part of its concrete roofing could tumble onto traffic.
Transport for NSW said the motorway was closed to westbound traffic between Haberfield and North Strathfield on Thursday morning because of emergency roadworks.
Transurban, which owns and operates the tunnel, said one of three westbound lanes was in the process of being reopened.
Transport for NSW coordinator general Howard Collins said engineers found "a couple of large bulges" in t
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