A noise barrier system and method for quickly and modularly installing or erecting a temporary sound interruption wall. The system can include one or more panels each, a leveling bracket adjustably mountable to a support member, a clamping bracket for mounting a panel to a support member, a double clamping bracket for clamping a pair of panels together and mounting them to a support member, and a panel clamp for clamping a pair of panels together. The leveling bracket can include a support wall to support portions of adjacent panels, and an arm for removably securing to a flange of the support member. The panel clamp, the clamping bracket and the double clamping bracket can each include open channel configuration configured to receive a single portion of a panel or portions of pair panels, and a slidably adjustable clip for securing the portion of the panels therein.