With the hit-and-run death of a nun in Water Mill on Monday, the message is clear that South Fork roads are no place for pedestrians. Only two weeks ago, this community had to digest the news that a high school student was struck and killed as he and several friends made their way on foot from the Amagansett train station to his house. And, although her death did not involve a pedestrian, a Montauk resident was killed when her car apparently went into the path of an oncoming pickup truck on July 4.