Good Riddles

Question: I sit on a bridge so you might see just how clear the world can be. What am I?

Question: I was crucified to keep murders out of the maze. What am I?

Question: 1 is 3, 3 is 5, 5 is 4, 4 is perfect. Why?

Question: Bobby's teacher gave him a math quiz. Every time he got an answer right, points would be taken away, so whoever had the most points, got the most questions wrong. Bobby's score was the highest, yet he still got the most questions correct out of the class. How is this possible?

Question: sometimes i hang, sometimes im crusty, sometimes im bloody, and yellow. What am i?