There remains another story about that, according to it, 'a surveyor, who had been requested many things on selecting the route, got angry and throw a ruler on the map, then they decided the route as the ruler had fallen'; however it is considered that both stories are only legends.
なお、この話については「測量技師がルート選定にいろいろ注文を付けられて腹を立て、放り投げた定規が地図の上に落ちたところに決めた」という異説もあり、いずれも伝説の域を出ないと思われる。