Why do you think I'm trolling? Why take the time to reply if you're not even going to answer the question? Maybe it's obvious to you, but the tutorial in the game didn't saying anything, I couldn't find any reviews that said anything, and it's not mentioned anywhere I could find.
Actually I had the exact same problem when I first started playing, I kept jumping into it thinking it was an obstacle... and actually got quite frustrated thinking that they added dead-ends in the game. I didn't see the turns either at first since you automatically notice that there is no end-rail and an object straight ahead.
So don't feel too bad TC, others have been in the same boat.
I honestly died the first 4 times on that as well, being like wtf? The poor color choice is at fault here, it's to discern anything clearly when EVERYTHING is of the same color tone (yellow-greenish yellow, orange and red....) Clearly these guys never heard of contrast