A state appeals court has rejected a lawsuit against the city of San Francisco by the family of a woman who was killed when her head slammed into the low ceiling of the Broadway Tunnel as she stood on the open upper deck of a private bus. Signs outside the western end of the tunnel provided an adequate warning to drivers of the lowered clearance of 13 feet, 6 inches ahead, the Court of Appeal panel said Thursday. The suit was filed by the husband and son of Diana Cushing Canning, 50, of Sebastopol, one of two passengers killed in...