Answer:
I save lives on the ground and in the air. What am I?
What gets sharper the more you use it?
I look at you, you look at me. I raise my right, you raise your left. What am I?
I'm sometimes white but most often I'm black. I take you there but never bring you back.
Crooked as a rainbow and slick as a plate, ten thousand horses can't pull me straight. What am I?
The profession of Jimi Hendrix and Eric Clapton