There's been a suggestion on this thread that because Sarah Stanton said the limousine went out of her view as it went down Elm Street this places her west of the entrance railing. Not true. Otis Williams was east of the railing and he told Larry Sneed in No More Silence:
I had a clear view as it passed by of the President and all in the car, and then it went behind a little wall going toward the underpass ... I didn't actually see the President hit as he went behind that little wall.