A woman died Wednesday afternoon after her car flipped and caught fire along southbound Highway 99 in Sacramento.
The crash happened shortly after 2 p.m. near 47th Avenue.
The driver hit a guard rail before flipping over. She was the only one in the car, officers say.
A group of witnesses pulled over to help but were unsuccessful.
The crash slowed traffic on Highway 99 to a crawl, as lanes were closed for hours.