Traveling in a group— How do you handle it?

Google maps allows you to share your location with specific people. My son has used that to catch up with me. I also use it when travelling with Grand Kids so the parents know where we are and when we will arrive. I only turn it on for these specific situations.

I hate to have people follow me. My son is the worse. He lags so far behind that it is a given that we will get separated by a traffic light. I also hate to follow my brother-in-law. He drives like a maniac and it is hard to keep up.