Long ago, Tokugawa Ieyasu was "just the straight road and easily attacked enemy". That made many winding roads. The remnants in the loop line in Tokyo right now.
Once upon a time, Ieyasu Tokugawa was considered "likely to be offensive to the enemy that it just the way of the straight line." Therefore it was made many a winding road. The relic is now in Tokyo loop line.
In the past, just a straight way "and" Tokugawa Ieyasu was attacked by the enemy. With so many tortuous road. Is a relic of the loop line in Tokyo today.