For bridges developed from standards for superstructure, use the load rating information documented on the standard. If there is no load rating information in the bridge standards, assume an inventory rating factor of 1.0 and operating rating factor of 1.3, which are lower bound numbers. Standards modified for aspects that would not otherwise affect the load rating, may also utilize the load rating information documented on the standard. No supporting calculations are needed for such standard and modified standard bridges, but load rating information must be transcribed to the New Bridge Load Rating Summary for Design Load Form and indicated on the bridge layout.