APPLE INSIDER
As handy as it is being able to share your exact location with someone directly from your iPhone, that doesn’t tell them how long it’s going to take you to get home. Here’s how to have your iPhone do that automatically.
You can have CarPlay, or your iPhone, keep friends and family updated on your driving ETAIf you tell someone you’re going to be home in an hour, they unthinkingly assume you’ll be anything from 50 minutes to 90, depending on you — and depending on traffic. You could be more exact and tell them over the phone that Apple Maps on your iPhone says it will be 55 minutes, but you’d be wrong.
Source: APPLE INSIDER