Investigators are still working to find out what exactly might have gone wrong.
Around 12:40 Saturday morning, a car drove off of northbound lanes of Highway 99 near Avenue 12 in Madera.
The car rolled over several times onto a nearby field before catching fire.
A man and woman inside the car died in the flames.
Officers say speed didn't appear to be a factor in this crash.
The victims killed in the wreck haven't been identified yet.