Emergency roadworks to fix a sunken section of the Gateway Motorway wrapped up at 4pm, but northbound traffic showed "no signs of easing" as peak hour continued.
Australian Traffic Network reporter Olympia Kwitowski said traffic on the Gateway Motorway was backed up from the roadworks near Wyampa Road down to Airport Drive, and surrounding roads were also affected.
"We've got massive delays northbound on Sandgate Road, through Virginia and Boondall," she said.
"Bowen Bridge Road, Lutwyche Road, Gympie Road and Gympie Arterial Road, very heavy northbound from the Valley all the way up to Bald Hills."
The speed limit had been reduced to 40km/h through the roadworks zone, and Ms Kwitowski said crews were going to return later on Thursday evening to complete the resurfacing.
EARLIER
Afternoon traffic has slowed to a crawl on the Gateway Motorway after a section of the road appeared to sink "close to a foot".
Cars were crawling from Bald Hills back to Boondall about 2pm after the incident about an hour earlier, according to the Australian Traffic Network.
Road crews had closed the right lane northbound to conduct emergency roadworks near Wyampa Road, close to the Bruce Highway interchange.
ATN traffic reporter Olympia Kwitowski said the traffic was "building by the minute" and was back to Bicentennial Road at Boondall.
She said the traffic had banked back to Nudgee by 2.30pm and the right lane was expected to be closed until 4pm.
Driver Julie Spasojevic said she was delayed about 15 minutes coming from Bracken Ridge.
"It just seems to be the lane is sinking," she said.
"I just drove past and saw it."
"It's just sunk like close to a foot in that area and they've got it blocked off."
A Department of Transport and Main Roads spokeswoman said works would be completed as soon as possible.
"This section has experienced some damage due to an issue experienced during asphalt works last night," she said.
"It is not a sinkhole."
Ms Spasojevic said the sunken section of road was close to where a car's right-hand tyre would usually travel in the lane.
"If you hit it at the speed you should be doing it would do damage," she said.