A Wil Mouse roller coaster (or Wildemous, Mad Mouse or Rat Run) is a type of roller coaster characterized by small cars that seat four people or fewer and ride on top of the track, taking tight, flat turns at modest speeds, yet producing high lateral G-forces. The track work is characterized by many turns and bunny hops, the latter producing abrupt negative vertical G forces. When approaching a turn from a straight section the intended impression is that one will simply continue straight, and thus plunge off of the device, this since there are no transition sections as are in a conventional high speed coaster track and the turn itself is obscured upon close approach. Almost all Wild Mice feature "switchback" sections, consisting of several of these unbanked turns, separated by straight sections Usually, the turns on the switchback section are 180°, but some coasters feature 90° turns as well, and more rarely steep runs with loops (for example Crazy Mouse at Tobu Zoo in Japan).