State Road 403 was a six-mile (10 km) northeast-to-southwest route that lies entirely within Clark County.

SR 420 was the original number of Tri-State Expressway; the name was later changed to Borman Expressway.The former State Road 431, now simply Keystone Parkway, remains a busy route connecting U.S. Route 31 with Interstate 465 at Exit 33.

State Road 431 was officially decommissioned on October 19, 2007,[citation needed] with the portions north of 96th Street being turned over to the city of Carmel.

[2] Carmel Mayor James Brainard immediately proposed banning heavy trucks from the route, the Hamilton County portions of which lies within his city's corporate limits.

He also pushed for a plan to build six roundabout-style interchanges on Keystone, built 2009–2010, in lieu of widening it to at least six travel lanes throughout.

Madison Avenue, which was the original routing of U.S. 31 on Indy's south side, does not have an interchange with I-465, however.

The northern terminus of this section was at Madison's intersection with East Street, which used to carry U.S. 31 to the south.

In 1956, the ferry shut down,[6] and State Road 762 was decommissioned, following the opening of the Wabash Memorial Bridge nearby.