Interstate 101 (I-101) is the recurring character in Intertropolis & Routeville. She is a female Interstate Highway shield who loves traveling and is good at reading maps, signs and directions. She is one of the 23 members of the Main Interstate Highway signs living in the Main Highway Lounge of Intertropolis. She is one of the two only Main Interstate individuals in the group whose numbers ending with a "1" instead of a "0" and a "5". The other one is I-1.