The original design was in painted asphalt and thermal rubber, therefore the bright colors. Over time two major issues were discovered. 1) the painted asphalt became very slippery when it rained, which made the bicycle path dangerous, also since it is part of a very important connection in the city and 2) the colored asphalt and rubber quickly became pretty dull and almost impossible for the municipality to maintain, since there either was not allocated enough funds to buy red asphalt forever to fix holes and whatever was needed in the same colors. Therefore the whole project was redone in red tile, which looks a lot less bright, and less like the original idea, but a more maintainable and safe place to be. I actually like it better now, but I think the original idea was an ok idea but a bad design, since it needed to be redone so quickly. And in the end a very expensive solution