Japan National Route 212
National Route 212 is a National highways of Japan, national highway of Japan connecting Nakatsu, Ōita and Aso, Kumamoto in Japan, with a total length of 106.8 km (66.36 mi). References

National highways in Japan Roads in Kumamoto Prefecture Roads in Ōita Prefecture {{Japan-road-stub ...
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National Highways Of Japan
Japan has a nationwide system of distinct from the expressways. The Ministry of Land, Infrastructure, Transport and Tourism and other government agencies administer the national highways. Beginning in 1952, Japan classified these as Class 1 or Class 2. Class 1 highways had one- or two-digit numbers, while Class 2 highways had three-digit numbers. For example, routes 1 and 57 were Class 1 highways while 507 (the one with the highest number) was a Class 2 highway. A 1964 amendment to the governing law resulted in a unification of the classes, which took effect in April of the following year. Highways numbered since that time have had three-digit numbers, so the numbers 58–100, which had so far been unused, remained unused. However, when Okinawa Prefecture reverted to Japanese control in 1972, Route 58, with its southern endpoint in Okinawa's capital city of Naha, was established. The numbers from 59 to 100 remain unused. Some other numbers have been vacated by the joining or ...
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