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Interstate 48 Pedestrian Walkway is a large sidewalk for pedestrians that only allows highway signs to walk on the middle and the side of Interstate 48 in Intertropolis and Routeville. It is the most dangerous sidewalk in Highway City because I-48 is a congested 100-mph (160-km/h) speed limit expressway. The sidewalk starts from I-21 in Intertropolis and ends at I-23 in Routeville.