The theory is it will keep traveler's speed down:
Is it just me or have other folks imagined music when driving over the various bumps glued to the road?
https://www.youtube.com/watch?v=lN8eEOz7PeY ]https://www.youtube.com/watch?v=lN8eEOz7PeY
There is also one in Lancaster, California with a part from William Tell.
jtk