Snake Way is a road which people have cross in order to get to King Kai's planet. It is located in Heaven or the Other World.
Overview
It is a long,narrow road which people have to use to get to King Kai,it is surrounded by clouds and if you fall,you'll go to Hell with Goz and Mez.
People who crossed it
King Kai (probably)
Yamcha,Tienshinhan,Chiaotzu and Krillin (to get to King Kai's)
King Yemma (probably)
Ginyu Force except for Ginyu (probably went to Hell)
Princess Snake and her attendants (to get to their house)