Curving tween?

Hey guys.
I am working on a project right now and i want to have 2 bars come up from the bottom of the screen and when they get near the top curve and continue horizontally. Like animated racing stripes. I got the verticle part rigth, just a simple shape tween but when i get to the curve is where i have problems, I have tryed key framing it but it takes a long time and it is a bit slow and choppy. do you guys think there is an easier way of doing it?