This is an isochronous map with multiple starting points
If you are not familiar with simple isochronous maps we recommend that you check it out first.
In this setup you can add multiple starting points and the map will show you the most accessible zones for all points. So for example the "less than 20 minutes" zone is reachable in less than 20 minutes by all start points.
Let's take an example: you want to meet a couple of friends for lunch. Set your current locations on the map and you'll quickly see the zones that are practical to meet.
Another typical example is finding a place to live with your significant other: you can plot the most commute-friendly places to reach from both your workplaces, and that would give you an extra criterion on choosing a new home.
And again, don't hesitate to send questions or comments our way! Happy commute :)