My car acts erratically at freeway speeds whats wrong?

It sounds as if you need a front end alignment right now. If this was not happening before you need a second opinion on the work done. I would get to it soon.

Go back to alignment shop. Not done correctly. They are on the hook for sending out an unsafe vehicle. Toe is incorrect, and maybe camber/caster. All part of wheel alignment job. It is not a job you can do at home.

hello. your note indicates to me the tires are not seeming 'proper' to you. for me, I have that feeling when the tires are rotated front to back also (that's how tiires are rotated now). Freeway speeds, freeways are different from 'surface' streets. You move faster, much faster. L'il ol' you and the 3000 pound vehicle you're in command of.

You'd' better take it back to the shop where you had the alignment done, maybe they put to much weight on one wheel, that happened to me once with my Fire bird and It was like driving a bumper car. i could hardly control it at speeds. don't try to guess what wrong. take it back and tell them what's happening

Sounds to me like swaybar links probobly broken or you could need struts. I'd have the suspension checked out by a local garage

GET THE CAR LOOKED AT BEFORE YOU KILL YOURSELF OR SOMEONE ELSE.

TRY FINDING AN INDEPENDENT SHOP INSTEAD OF THE DEALER OR A CHAIN STORE BECAUSE YOU WILL BE OVERALL MORE PLEASED WITH THE FINDINGS AND THE SERVICE.