Look how early this left lane is :/. https://www.google.com/maps/@38.6227498,-90.2858963,3a,75y,221.67h,88.71t/data=!3m7!1e1!3m5!1s2KD9c9oNHJhwZ8L4CtxfHQ!2e0!5s20130401T000000!7i13312!8i6656
Because of right-turning truck traffic from the road to the left across the tracks. That's a pretty sharp curve.