[1] SR 51 travels north on Lake Park Avenue from US 30, crossing Old Lincoln Highway and the mainline of the Canadian National Railway in the former town of Ainsworth before turning east on 10th Street in Hobart.

The concurrency with US 6 ends here and SR 51 continues north a short distance to its northern terminus at US 20.

[3][4][5] No segment of State Road 51 in Indiana is included in the National Highway System (NHS).

[6] The NHS is a network of highways that are identified as being most important for the economy, mobility and defense of the nation.

This measurement is a calculation of the traffic level along a segment of roadway for any average day of the year.