To know and to have a feeling for how far it is between different places and the size of different objects is a great use to you.
At the amusement part Gröna Lund in Stockholm there is the attraction “Free Fall”. In order to be lifted up and released from the 80 meter tall tower, you need to have a height between 140 and 195 cm.
On traffic signs the distances between places are given in kilometers.
Did you know that the distance from the Earth to the Sun is 149,600,000 km?
This is the same distance as 3,470 times around the Earth