Whenever, between the hours of 7:15 a.m. and 5:00 p.m. persons, teams or vehicles have been delayed fully ten (10) minutes, by reason of the drawbridges being open for vessels or boats to pass through, the captain, bridge tender or other person in charge of the drawbridge, shall lower the red ball or red lantern, and immediately close such draw and keep the same closed for fully ten (10) minutes for such persons, teams or vehicles to pass over, if so much time shall be required, when such draw shall be opened again and be kept open, if necessary for vessels or boats to pass, for a like period of ten (10) minutes, and so on alternately if necessary, during the hours aforesaid.