There is a little meaning here, say to drive the vehicle to the bottom of the slope, extinguish the engine, the car will be under the magnetic force slowly from the bottom of the slope to the top of the slope. The vehicle is indeed like this when I go to play, but the tour guide said that it was just using the visual illusion. Use the environment to make our eyes mistakenly think that the downhill we see is uphill, so we thought that the vehicle itself slides from the bottom up or the gravity action from the top down. Sliding.