A tractor-trailer overturned about 10:30 a.m. Tuesday on the on-ramp from Edgewood Avenue to Interstate 95 on the Northside.
The driver was headed east on Edgewood, taking a left onto I-95 North. He said he was going slow but felt his trailer start to topple.
A Hazmat crew was cleaning up the gas spilled from the truck.
Drivers were being detoured.