A reinforcement member of an automotive side sill includes a V-shaped cross-sectional portion formed by bending the reinforcement member so as to follow a lower surface of an upper portion of an outer panel, joining an upper attaching portion functioning as a resulting bent portion to the upper portion of the outer panel and bending a distal end of the upper attaching portion downwardly. Further, a clamping jaw is provided that engages over the opposite side of the connection plate in the closed position. The strings of each rule are linked, thereby providing a required order. The switch activates the light emitter when the motorcycle changes its orientation, as when a front or a rear wheel is raised above the ground.