[Alan Anderson]

The examples do show you how to read the sensor values. What you do with the results is up to you.

So what do you want to do with them? That's the question you need to answer in detail before you can get advice on how to do it. "Set distance" and "monitor travel" are too vague. You need to give much more detail on how your robot is designed, where you plan your sensors to be, and exactly what your goal is.