How horrible for you! I think you are to be commended for getting out of your vehicle on a busy road to try and save this poor kitten! It's obvious that no one else thought or cared enough to even try. You would have felt horrible if she had been hit running from you and I would have done what you did. You did a wonderful thing and the blame is on the caregivers of this kitten that should have never been outside near a busy street!
Thank you for caring enough to stop and try to help her.