Answer:
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
I am used when you jump off a bridge for fun.
You can read me both ways I wear; One way it's a number reversed a snare.
You throw away my outside you cook my inside. Then you eat my outside and you throw away my inside.
I am always coming but I never arrive. What am I?
I've been argued on my color. Without me you'll die. So many attempts on your life use me so make sure you have many of my White friends.