A stretch of Carmel Mountain Road near Vista Sorrento Parkway is closed due to the leak, according to San Diego police.​
The spill happened on northbound I-5, just south of Via de la Valle, according to the California Highway Patrol.
A semi-truck and two other vehicles collided on northbound Interstate 5 at Del Mar Heights Road, according to the CHP.
The vehicle fire was reported at 1:44 p.m., according to the California Highway Patrol.
Multiple lanes were temporarily blocked due to the car fire.