The draw of the Quincy Weymouth SR3A bridge, mile 3.5 between Quincy Point and North Weymouth, Massachusetts, shall open on signal, except that:
(a) From 6:30 a.m. to 9 a.m. and from 4:30 p.m. to 6:30 p.m., Monday through Friday, except holidays observed in the locality, the draw need not be opened.
(b) The draw shall open on signal at all times for self-propelled vessels greater than 10,000 gross tons.
(c) From noon to 6 p.m. on Thanksgiving Day, from 6 p.m. on December 24 to midnight on December 25, and from 6 p.m. on December 31 to midnight on January 1, the draw shall open on signal after at least a two-hour advance notice is given by calling the number posted at the bridge. [CGD01-94-159, 60 FR 2688, Jan. 11, 1995, as amended by CGD01-00-135, 65 FR 38207, June 20, 2000; CGD01-04-096, 69 FR 67058, Nov. 16, 2004]