Indiana State Road 431
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State Road 431 is a busy route connecting U.S. 31 with Interstate 465 at Exit 33. It passes through the Indianapolis suburb of Carmel. It allows traffic on U.S. 31 north of Carmel a shorter route to I-465 and the eastside of Indianapolis.
A former southern portion of SR 431 extended south along Madison Avenue from the south side of Indianapolis through Greenwood. Madison Avenue does not interchange with I-465, however.