For your interest, this is not a “BRT” by any standard. There’s no dedicated lanes, signal priority, or off-board payment and all-doors boarding. Japan is basically using it as a foreign buzzword for articulated bus, similar to how “LRT” simply means a modern (articulated) tram.
The only closest “BRT” example in Japan is not called a “BRT” from history, but a “trunk bus” system in Nagoya (officially “Key Route Bus”), specially the Route 2 corridor mostly on Aichi Prefecture Route 215 Dekimachi-doori (Avenue). Coincidentally, this is almost the same as the Korean term, except missing the “Express” word.
It has been drawn correctly with lanes:bus= , and only separate highway= road at bus stops Way: 出来町通 (667850633) | OpenStreetMap
=service vs =busway should be discussed before Highway=busway on non-BRTs
There are a few other proper “BRT” systems in rural regions around the country, as a replacement bus service on closed rail lines. But their raison d’etre is weak, when the lack of traffic congestion means it’s not neccessary short and reliable travel time. Quite the opposite, the legacy from rail lines means they are often further away, not as convenient as bus stops on ordinary roads would be.
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