Speed and dense fog were factors in a two-vehicle collision on Highway 99 in Turlock that resulted in one fatality on Monday, the California Highway Patrol reported.

The identity of the deceased has not yet been determined. The only information provided by the CHP was that it was a woman.

The collision happened just after midnight Monday on southbound Highway 99, north of Linwood Avenue.

The deceased was driving a 2016 Ford Explorer southbound in the middle lane. The CHP said the exact speed of the Ford is unknown, but that it was at a high rate.

The woman drove the Ford directly into the back of a 2019 Freightliner Cascadia that was also traveling southbound on the highway in the middle lane.

The force of the impact sent the Ford Explorer careening out of control across the highway and off the right shoulder, the CHP reported.

The Ford struck a fence and then a tree. It sustained major damage and subsequently ignited and was quickly engulfed in flames, according to the CHP.

The driver was pronounced deceased at the scene.

The driver of the Freightliner, Edward Mhindi, 50, of Elk Grove was not injured.

Visibility on the highway was very limited due to dense fog.

The deceased was not wearing a seatbelt at the time of the collision.

The investigation is ongoing and it is unknown at this time if alcohol and/or drugs were factors in the collision.