From a global viewpoint, many of the nations requiring high-speed railways don't have severe transportation conditions as in Japan, such as geographical conditions and measures for noise.
世界的に見ると、高速鉄道を必要とする国には、日本の様に地理的条件や騒音対策、輸送量の面で過酷な条件に置かれているケースはさほど多くはない。