I was driving on the highway the ABS light came on

Hello,

When the on-board diagnostics detects a fault within the ABS system the light gets illuminated.
There are several reasons of why the ABS light come on.
It could be due to a faulty wheel speed sensor, corroded wiring, bad module etc.
Best course of action would be to have the vehicle scanned for ABS codes. As that can help with the diagnostics.

Here is a helpful video:

https://youtu.be/rTtAnsOlZU4

Take a look at this guide, it covers the typical issues with the ABS system:

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

I have attached diagrams for ABS components below.

Please let me know if you have any questions.
Thank you.