Japan National Route 406

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National Route 406 shield

National Route 406
国道406号
Route information
Length: 192.5 km (119.6 mi)
Highway system
National highways of Japan
Expressways of Japan

National Route 406 is a national highway of Japan connecting Ōmachi, Nagano and Takasaki, Gunma in Japan, with a total length of 192.5 km (119.61 mi).