A safety sign device is for a vehicle. The safety sign device includes a first sign having proximal and distal end, a first hinge being coupled to the proximal end of the first sign, the first hinge being coupled to a side of the vehicle, and a second sign being coupled to the side of the vehicle and being substantially parallel to the side of the vehicle. The first hinge is configured to extend and retract the first sign between a retracted position and an extended position. The first and second signs may be transverse to each other in the extended position, and may be flat against the side of the vehicle in the retracted position. The safety sign device includes a first flexible arm coupled to the first hinge and having an elongate housing, and visual indicators carried by the elongate housing.