Whenever any public street is obstructed or rendered impassable for vehicles by an excavation therein, or by the occupation thereof by building materials, or by any house in the process of moving, the person so obstructing such street shall immediately notify the Chief of Police of the location of such excavation or other obstruction, and of any change therein from day to day during the progress of the work causing such obstruction.
('73 Code, § 5.08(i))