A floor is partitioned into a plurality of areas S1 to S4 by a floor tunnel portion 11, side frames 13, side sills 12, and cross members 7, 8, 15, and 16, and the rigidity of the floor panels of the areas S1 to S3 is adjusted by rigidity adjustment portions 20, 21, 22, 23, and 25. Further, the mode information is information for indicating that a prescribed mode corresponds to which one of at least three modes. This system is cost effective and can maintain a uniform interface between different types of materials. A barrier divides the light emitting structure into first and second segments that are electrically isolated from one another.