Multiple lanes had been closed, slowing traffic to a crawl.
And drivers are warned to continue to expect delays.
Traffic remains very heavy in both directions.
Southbound traffic is queued back onto the M2 in Macquarie Park and northbound traffic is slow on the Eastern Distributor, Victoria Road at Drummoyne, and on all roads approaching the Rozelle Interchange.
Motorists are advised to allow plenty of extra travel time and exercise caution.
Buses travelling across the Harbour Bridge have also been delayed.
People travelling north should consider using Victoria Road or the Sydney Harbour Tunnel instead.
Aerial footage showed traffic crawling along the bridge as dozens of emergency vehicles attended the scene.