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March 18, 2011East Nippon Expressway Co., Ltd.
(3) 23 depressions on the road surface (maximum depth of 30 cm)Joban Expressway Iwama IC
(4) 174 steps on the road surface of 2 cm or more (maximum 100 cm)Joban Expressway Hirono-Joban Tomioka (upper and lower lines)