Japan is dominated by public transit and is one of the countries least affected by it. Transit is not unsafe when people follow distancing procedures and wear masks / don't talk loudly. This was backed up by research

"It’s a similar situation in Japan, where researchers failed to connect a single cluster to the country’s commuter trains, said Hitoshi Oshitani, a virologist and public health expert at Tohoku University. The vast majority of the clusters were instead traced to gyms, bars, live music venues, karaoke rooms and similar establishments where people come in close contact with one another,"

https://www.scientificamerican.com/article/there-is-little-e...