This paper details the National Highway Traffic Safety Administration’s (NHTSA) continuing research and testing activities on large school bus safety restraints. This paper will discuss relative performance of compartmentalization, lap belt restraints and lap/shoulder belt restraints, as well as the effects of seat back height and seat spacing on the performance of these safety restraint strategies. Results of NHTSA’s frontal sled testing efforts with an inflatable airbag belt system are reviewed. The agency’s efforts on researching side impact protection are also briefly discussed. This paper supplements the results presented in the 17th Enhanced Safety of Vehicles Conference (ESV), Paper No. 345, “Large School Bus Safety Evaluation” [1], and discusses results for tests that were conducted subsequent to the publication of that paper.