 The other usage with the promulgation of the 2009 MUTCD is to use a new yellow toll plate above the marker along tolled segments of highways.Loop routes, in terms of special routes, are loops that form a complete radial around an area, having at least one intersection with the parent route.Because of their circumferential nature, inner/outer directions have been used to sign such routes, as opposed to cardinal directions, though this convention is not universally followed (Arizona Loops 101, 202, and 303 in the Phoenix metropolitan area do not follow such convention, and are signed with cardinal directions based on their local orientation).