Chūō-ku no relation Chiba Ibaraki Prefectural Road and Chiba Prefectural Road Route 2
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.
no relation