For the second question: As a pilot - you understand that icing can occur in certain situations, even if it hasn't been reported or forecasted (ie: it's UNKNOWN). As a driver, one is expected to also understand this. Icing CAN be expected, even if it's unknown. THAT is why your wife did commit the offense she is charged with. AGAIN, you may, in fact, end up with a judge who is sympathetic to the situation, but it doesn't change the fact that she failed to maintain reasonable control of her car, based on the conditions.