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'''State Road 431''' was a state road connecting [[U.S. Route 31 in Indiana|U.S. Route 31]] with [[Interstate 465]] at Exit 33. It passed through the [[Indianapolis, Indiana|Indianapolis]] suburb of [[Carmel, Indiana|Carmel]], allowing traffic on U.S. 31 north of Carmel a shorter route to I-465 and the east side of Indianapolis. Until the 1990s, the SR 431 designation extended south of I-465 to 86th Street. Prior to that, it also continued south along N. Keystone ParkwayAvenue to [[Indiana State Road 37|State Road 37]] at Fall Creek Parkway, North Drive in Indianapolis. A second section of SR 431 followed the old route of U.S. 31 between [[Greenwood, Indiana|Greenwood]] and the south side of Indianapolis.
==Route description==
===Northern section===
Beginning at a junction with SR 37 just northeast of downtown Indianapolis, SR 431 traveled north along Keystone ParkwayAvenue. While on Keystone ParkwayAvenue, SR 431 passed through a mix of residential and commercial properties. The highway passed through an interchange with 86th Street (formerly [[Indiana State Road 100|SR 100]]) and [[Interstate 465]]. The highway terminated at US 31 in Carmel.<ref name="bing maps northern section"/>
==History==
The southern section of SR 431 was created when the US 31 bypass of [[Greenwood, Indiana|Greenwood]] and [[Southport, Indiana|Southport]] was built between 1940 and 1945. This section extended south along Madison Avenue from the south side of Indianapolis through Greenwood. Madison Avenue was the original routing of U.S. 31 on the south side of Indianapolis. The northern terminus of this section was at Madison's intersection with East Street, which formerly carried U.S. 31 from downtown to the south. The southern terminus was where Madison merges with existing U.S. 31 alignment in [[Johnson County, Indiana|Johnson County]] just south of Smith Valley Road, south of Greenwood Middle School.
The northern section of SR 431 was moved when the Keystone ParkwayAvenue construction, along with the I-465 construction, was completed in 1967. Around 1965, SR 431 began at the junction of SR 37 at Fall Creek Parkway, north along Keystone ParkwayAvenue to the interchange at 86th Street, then west along 86th Street (at the time, SR 100) to Westfield Boulevard, then north into Carmel. With the completion of I-465 in the area, SR 431 was removed completely from Westfield Boulevard.
SR 431 was officially decommissioned on October 19, 2007,{{citation needed|date=November 2008}} with the portions north of 96th Street being turned over to the city of Carmel.<ref name="Camel gets SR 431">{{cite press release |url=http://www.in.gov/portal/pressAndEvents/11063.htm |title=Daniels announces agreement to transfer ownership of Keystone Avenue |publisher=[[Indiana Department of Transportation]] |accessdate= September 6, 2007}}</ref> Carmel Mayor James Brainard immediately proposed banning heavy trucks from the route, the Hamilton County portion of which lies within his city's corporate limits. At this point, the street name was changed from Keystone ParkwayAvenue (a designation that remains south of the county line at 96th Street in Indianapolis) to Keystone Parkway. Brainard also pushed for a plan to build six [[roundabout]]-style ([[dogbone interchange|"dogbone"]]) interchanges on Keystone, built 2009–2010, in lieu of widening it to at least six travel lanes throughout.<ref name="Camel's plane">{{Cite news|url=http://docs.newsbank.com/openurl?ctx_ver=z39.88-2004&rft_id=info:sid/iw.newsbank.com:AWNB:GPTB&rft_val_format=info:ofi/fmt:kev:mtx:ctx&rft_dat=11BA8598F2732558&svc_dat=InfoWeb:aggregated5&req_dat=0B0A2F7372D54C748F8A8C4C17175B68| title=Carmel gets road, state pays |accessdate=October 29, 2012| newspaper=Post-Tribune |page=A6 |author=The Associated Press |date=September 8, 2007 | isbn=9780803225640 |oclc=2266386}}</ref> On December 30, 2019, another such interchange was opened at the junction with 96th Street.<ref>{{cite news | url = https://www.youarecurrent.com/2015/06/09/brainard-moves-forward-with-plans-for-96th-and-keystone-interchange/ | title = Brainard moves forward with plans for 96th and Keystone interchange | last = Aasen | first = Adam | date = June 9, 2015 | newspaper = Current | location = [[Carmel, Indiana]] | accessdate = November 9, 2020 }}</ref><ref>{{cite news | url = https://www.wthr.com/article/news/local/changes-coming-96th-st-and-keystone/531-d6c2dd08-3a30-4bb6-b6c8-545b49204d83 | title = Changes coming at 96th St. and Keystone | author = Staff | date = June 14, 2019 | publisher = [[WTHR]] | accessdate = November 9, 2020 }}</ref><ref>{{cite news | url = https://www.indystar.com/story/news/local/hamilton-county/carmel/2019/11/21/carmel-keystone-parkway-bridge-96th-street-open/4259400002/ | title = Carmel: Keystone Parkway bridge at 96th Street will open this week | last = Lange | first = Kaitlin | date = November 21, 2019 | newspaper = [[The Indianapolis Star]] | accessdate = November 9, 2020 | url-access = subscription }}</ref><ref>{{cite news | url = https://cbs4indy.com/news/interchange-at-96th-and-keystone-opens-to-traffic-in-all-directions/ | title = Interchange at 96th and Keystone opens to traffic in all directions | last = Myers | first = Zach | date = December 30, 2019 | publisher = [[WTTV]] | accessdate = November 9, 2020 }}</ref>
==Major intersections==
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