The draw of the Seaboard System Railroad bridge, mile 5.3 at Seabrook, and the draw of the US21 bridge, mile 7.0 at Beaufort, shall open on signal from 6 a.m. to 8 p.m. Monday through Friday if at least 24 hours notice is given. At all other times, the draw need not be opened for the passage of vessels.
33 C.F.R. §117.927