Abstract: A strap fixing device is suitable to fix a strap to a fixed object and includes a body, a fixing piece and a locking piece. The body includes a crown part, a body part and a holding part, wherein the crown part forms a locking hole; the body part is connected to the crown part and forms a fixing hole. The fixing piece is suitable to be penetratingly disposed at the fixing hole and includes a fixing surface and an abutted surface, wherein the fixing surface corresponds to at least a part of a surface of the fixed object, and the abutted surface is configured relative to the fixing surface. The locking piece is suitable to be penetratingly disposed at the locking hole and includes an abutting surface, and the abutting surface optionally abuts against the abutted surface.

Abstract: A traffic light including a plurality of light emitting elements and at least one light guide plate is provided. Each of the light emitting elements is configured to emit a light. The light emitting elements are disposed beside a light entering surface of the at least one light guide plate. Each of the lights enters the at least one light guide plate through the light entering surface of the at least one light guide plate.