Answer:
When it comes to me you go on red and stop on green.
What can you catch but never throw?
I am pronounced as one letter, written with three. I come in blue, black, brown, or grey. Reverse me and I read the same either way. What am I?
Iām hard as a rock and as light as a feather. Iām passed on to one another. Poor people need me and rich people have me.
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.