A. The permittee shall take appropriate measures to assure that, during the performance of the excavation work, traffic conditions as near normal as practicable shall be maintained at all times so as to cause as little inconvenience as possible to the occupants of the abutting property and to the general public; provided, that the administrative authority may permit the closing of streets and alleys to all traffic for a period of time prescribed by him, if, in his opinion, it is necessary.

B. The written approval of the administrative authority may require that the permittee give notification to various public agencies and to the general public. In such case, the written notice shall not be valid until such notice is given.

C. Warning signs shall be placed far enough back of the construction operation to alert traffic within a public street and cones or other approved devices shall be placed to channel traffic, all in accordance with the "Manual on Surface Traffic Interference Problem as Caused by Substructure Construction and Operation," prepared by a subcommittee under the direction of the Substructure Committee of Los Angeles (including latest revisions).

D. Warning signs, lights, etc., unless specified by the administrative authority, shall conform to the requirements of the "Manual of Warning Signs, Lights and Devices for Use in Performance of Work Upon Highways," published by the state of California Department of Public Works. (Ord. 106 §8, 1961).