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I-21

Interstate 21 (I-21) is a supporting character in Intertropolis & Routeville. She is a female Interstate Highway shield who is the younger sister of Interstate 23, the daughter of Interstate 248, and the princess of Intertropolis. She is a little bratty to her brother I-23 as the Interstate 23 highway travels through Routeville. She is voiced by Kimberly Blanding.