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The Coast Guard uses these routine and frequent regulations to establish control of access to maritime areas to ensure the safety of events, vessels, or individuals. Many of these zones are of short duration, ranging from a few hours to a few days, and all are geographically limited in area. Safety zones, defined in 33 CFR 165.20, are established for events such as fireworks displays, high-speed races, bridge repairs, dredging, or salvage operations, or the transit of dangerous cargoes such as explosives or liquefied petroleum gas. Safety zones are promulgated by Captains of the Port or District Commanders. These routine and frequent rulemakings support the Coast Guard's broad roles and responsibilities of maritime safety and maritime stewardship. Safety zones under the Outer Continental Shelf Lands Act are also included in these routine and frequent regulations. A total of 300 events are expected annually. The Coast Guard also removes or modifies safety zones as needed.