The northbound lanes of Highway 99 were reopened today about 1 p.m., about nine hours after an overturned tractor trailer carrying hazardous materials snarled traffic.

The minor collision at 4 a.m. turned traffic into a major headache, as the northbound lanes were closed to traffic at Avenue 24 near Delano.

Call the Caltrans automated road conditions line at 1-800-427-7623 for the latest updates.