When traffic conditions, the safety or convenience of the traveling public, or the public interest require that the excavation work be performed as emergency work, the Director of the Department of Public Works shall have full power to order at the time the permit is granted that a crew of men and adequate facilities be employed by the permittee 24 hours a day to the end that such excavation work may be completed as soon as practicable.
(1990 Code, § 4.21)