Japan National Route 51
National Route 51 is a national highway of Japan connecting Chūō-ku, Chiba and Mito, Ibaraki.

Route data
Length: 124 km (77.05 mi).

History
Route 51 was originally designated National Route 123 on 18 May 1953 as , and then was redesignated Route 51 when the route was promoted to a Class 1 highway.

References

051
Roads in Chiba Prefecture
Roads in Ibaraki Prefecture