I reversed the direction, changed the scale and the colors and got a moonwalk-like motion instead. Change the colors back to #ff0 and #00f to see what difference they make!
The oscillating look might mainly be an effect of the small scale.
The black and white lines in the background are only 1px wide and after moving one pixel, the busses touch a black bar either at the left or the right.
The black and white lines in the background are only 1px wide and after moving one pixel, the busses touch a black bar either at the left or the right.