I think you got off very lightly.
It's OK saying you were the only car on four lanes, but if you had crashed, that wouldn't be the case. What of the fire and ambulance crews, police, that would have been necessary to save you, doctors and nurses at the hospital.... and at that speed a very small amount of debris would have been all it takes. People that don't even know you would have been effected.
Very short sighted to consider you weren't hurting anyone.