The RX 450h is built with a welded-steel unibody frame, strong box-section, side-impact door beams and impact-dissipating front and rear crumple zones. As a result of information gathered during the 233 crash tests performed on the RX during development, reinforcements to the roof, roof header, floor, crossmembers and the A-pillar help provide increased buckling strength and enhanced load sustainability when buckled, helping to reduce the deformation of the cabin in the event of certain collisions.