Where is the speed sensor(s) located?

Yep, this car does not have a VSS sensor, the speedometer, ABS and traction control gather their data through the wheel speed sensors. It sounds like one of them is bad, I would raise the car up to see if the of the wheel speed sensors wiring got damaged by road debris.

This guide can help raise the car up:

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

Here is the locations of the sensors, also it would help if we could scan the ABS and traction control system.

This video will help:

https://youtu.be/Pb6nXV-iamI?si=rKHTww7-MvxpI5EJ

and this video will help you get the codes which would tell you which sensor it is.

https://youtu.be/rTtAnsOlZU4?si=JQ3ra5OB7X4906hj

This problem can be also caused by a bad wheel bearing hub because the sensor is not aligned with the reluctor wheel. Do you hear a roaring noise at about 60 MPH? If so, I would check the bearings first. Check out the images (below). Please upload pictures or videos in your response to any problems so we can see what to help you with.