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| 国道420号 | ||||
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| Route information | ||||
| Length | 66.5 km[1] (41.3 mi) | |||
| Major junctions | ||||
| West end |  National Route 153 inToyota, Aichi | |||
| East end |   National Route 151 /National Route 257 inShinshiro, Aichi | |||
| Location | ||||
| Country | Japan | |||
| Highway system | ||||
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National Route 420 is anational highway ofJapan connectingToyota, Aichi andShinshiro, Aichi in Japan, with a total length of 66.5 km (41.32 mi).
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