The provisions of section 4 (a) and (b) of the Ports and Waterways Safety Act as delegated to the Commandant of the U.S. Coast Guard in Pub. L. 107-296, 116 Stat. 2135, authorize the Commandant to specify times of movement within ports and harbors, restrict vessel operations in hazardous areas and under hazardous conditions, and direct the anchoring of vessels. The sections listed in § 110.1a of this subchapter are regulated under the Ports and Waterways Safety Act.