This is useful for navigation and planning. You can see in advance how much time you will spend in the subway, how much to go to the station from the nearest sight, and how to get there. For example, you want to see the Colosseum at sunset, and then catch the Barberini Garden, but you cannot imagine how long it will take to go there taking into account the subway. You can lay a route including the subway. The map will calculate the time in the subway and walk to the attraction if it's nearby the station. You will be able both to see the Colosseum in the lights and walk in one of the most beautiful parks of Rome.