| 释义 |
{{Infobox road
|country=JPN
|type=National
|route=420
|maint=
|alternate_name=国道420号
|map=
|image=Route420 Asuke.JPG
|length_km=66.5
|length_round=
|length_ref=
|established=
|direction_a=
|terminus_a=
|junction=
|direction_b=
|terminus_b=
|browse=
}}National Route 420 is a national highway of Japan connecting Toyota, Aichi and Shinshiro, Aichi in Japan, with a total length of 66.5 km (41.32 mi). {{commonscat|Route 420 (Japan)}}{{Japan-road-stub}} 1 : National highways in Japan |