They allow Disney employees ("cast members") to perform park support operations, such as trash removal, and for costumed characters to quickly reach their destinations on the surface out of the sight of guests to avoid ruining the illusion that is being created.

According to modern legend, Walt Disney was bothered by the sight of a cowboy walking through Disneyland's Tomorrowland en route to his post in Frontierland.

[3] The largest system of utilidors is beneath Walt Disney World's Magic Kingdom, but they are not a basement, contrary to popular belief.

[4] The utilidors are built on 9 acres (3.6 ha), and the floor plan is a circle with a path down the middle; the tunnel walls are color-coded to make it simple for cast members to determine their location.

Gasoline-powered vehicles are not allowed in the utilidors, with the exception of armored cash pickup trucks and, in extreme emergencies, ambulances.