Abstract: A pavement sprayer has at least one portion of its sprayer mechanism which is movable between an operative position and a retracted, inoperative position. At least one blocking member is mounted to the sprayer mechanism for movement between a blocking position, in which any spray emanating from the movable portion is at least partially blocked, and a nonblocking position, in which spray emanating from the movable portion is not blocked. The blocking member moves between its blocking and nonblocking positions in response to movement of the sprayer mechanism between the operative and retracted positions. In a preferred embodiment, at least one device senses the position of the movable portion and causes the blocking actuator to place the blocking member in the blocking position whenever the movable portion of the sprayer mechanism is in its retracted, inoperative position.