Officials say a "pavement heave" occurred in the southbound lanes in Toms River, causing southbound traffic to be backed up for up to 15 miles in Ocean and Monmouth counties.
Heaving happens when moisture trapped under asphalt is subjected to extreme temperatures.
They said it could take several hours, but many of the delays cleared up late Tuesday.
Officials with the New Jersey Turnpike Authority said the GSP was repaired and reopened by 10 p.m.
----------
* Get Eyewitness News Delivered
* More New Jersey news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube