U.S. Route 20 in Indiana
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| Route information | ||||
| Maintained by INDOT | ||||
| Length: | 155.50 mi (250.25 km) | |||
| Existed: | 1926 – present | |||
| Major junctions | ||||
| West end: |
   US 12 / US 20 / US 41 at Illinois state line |
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US 41 at WhitingUS 12 at Gary   I-65 / I-90 / Indiana Toll Road at Gary US 421 at Michigan City I-94 near Michigan City US 35 near Michigan City US 31 at South Bend US 33 at Elkhart I-69 near Angola
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| East end: |
US 20 at Ohio state line |
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| Location | ||||
| Counties: | Lake, Porter, LaPorte, St. Joseph, Elkhart, La Grange, Steuben | |||
| Highway system | ||||
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U.S. Route 20 (US 20) in Indiana is a main east–west highway that is parallel to the Indiana Toll Road. The western terminus of US 20 is at the Illinois state line and the eastern terminus is at the Ohio state line. US 20 through Whiting, East Chicago, and Gary is concurrent with US 12 twice. The route varies between one-way, two-lane, and four-lane streets, in northwestern Indiana. From the east side of Gary to west of South Bend, US 20 is a four-lane undivided highway. The route then heads around the west and south sides of South Bend and Elkhart as a four-lane limited access divided highway. East of Elkhart County Road 17 (CR 17), US 20 is two-lane rural highway.
US 20 was part of the Dunes Highway from the Illinois state line to Michigan City, concurrent with US 12. The Dunes Highway started being paved in 1922. The section of the highway, that is known as Lincoln Way as part of the 1913 section of the Lincoln Highway. Indiana State Highway Commission, later renamed Indiana Department of Transportation, began signing US 20 in 1926. US 20 went through downtown South Bend and Elkhart before the St. Joseph Valley Parkway was built. Before the parkway was completed, the route that was open to traffic was called Bypass US 20. A small realignment in LaGrange County was done in 2005, in which the roadway was straightened. Other small realignments included the route through Michigan City, which followed US 35 from US 12 to I-94.
Only the segment of US 20 that is concurrent with the St. Joseph Valley Parkway are included as a part of the National Highway System (NHS). The NHS is a network of highways that are identified as being most important for the economy, mobility and defense of the nation. The highway is maintained by the Indiana Department of Transportation (INDOT) like all other U.S. Routes in the state. The department tracks the traffic volumes along all state highways as a part of its maintenance responsibilities using a metric called average annual daily traffic (AADT). This measurement is a calculation of the traffic level along a segment of roadway for any average day of the year. In 2010, INDOT figured that lowest traffic levels were the 3,390 vehicles and 1,090 commercial vehicles used the highway daily near the Ohio state line. The peak traffic volumes were 36,040 vehicles and 731 commercial vehicles AADT along the section of US 20 concurrent with SR 331.
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