A signaling device for increasing visibility of a mobile robot. The signaling device comprises (a) a base section, attached with a rotational joint to a side of the mobile robot, said rotational joint allowing the device to rotate clockwise and/or anticlockwise relative to the mobile robot, the rotational joint constructed and adapted to return the device to an equilibrium position; and (b) a body section comprising a mast, the body section flexibly attached to the base section at a lower extreme of the body section.