Serpent Road

Serpent Road (FUNimation's dub: Snake Way) is a multi-million mile road in the manga and anime of Dragon Ball Z. It is located in The Other World, above Hell, and leads from Emma-Daiō's palace to North Kaiō's planet, and is the only method of getting to the latter (other than teleporting). In the anime, it is also the home of Princess Snake.

The only one ever to have run the long road was Emma-Daiō. However, when Son Gokū died, he was also able to make the journey. He did fall off into Hell but in the anime only. He eventually found his way back and succeeded in the trip.

Later in the series, Yamcha, Tenshinhan, Chiao-tzu and Piccolo also make the incredibly long adventure even faster than Goku did. In anime filler, the Gi'nyu Special Corps. have too made the journey, as they fight the forementioned warriors (except for Piccolo who was wished back to life) on North Kaiō-sama's planet in the anime. But it is never stated if both parties encountered met or had to get pass Princess Snake.

Eventually, North Kaiō-sama's planet is destroyed, making the road a total waste of time, and it is never seen or heard of again.