Crossroads are considered sacred in almost all magical traditions. A crossroads is a universally accepted place to hold rituals, leave offerings, or dispose of items you wish to be rid of. While this is not a natural creation but one that is homemade, it still falls in the realm of earth.
It is believed that Hecate rules over the three-way crossroads. She can see the past, present and future, It is said that if you should approach a three-way crossroads at night, you would hear her black dogs howling. Her altars have been erected at such places for centuries.
The four-way crossroad are considered to be powerful because all four directions meet at one point. Dirt, rocks and sticks gathered from such a crossroads are said to have powerful spiritual connections, albeit tricky ones to master. In Greek myths, Oedipus met his fate at the crossroads. From the Yoruban people we have Legha (a god known for his clever tricks) ruling the crossroads.
Ancient people were afraid of what it meant when one direction met another direction. All manner of folklore is available concerning the crossroads. Fairies are said to hand about there, along with ghouls and goblins. Even the Christian Satan is said to roam the crossroads.
Earth Witches know that a crossroad is actually a place of sacred transformations, manmade or not. Frequently they see them as a metaphor for transformational points in our lives. In such a capacity the crossroads relate to time.