When fire apparatus access roads, frontage spaces, private hydrants or yard hydrants are required to be installed in connection with a newly constructed building or structure, such roads, frontage spaces and hydrants shall be installed and made serviceable prior to and during the time of construction, except that, in connection with a phased development, the provision of fire apparatus access and water supply shall be as set forth in design and installation documents approved by the department. Interim access and water supply arrangements will be considered pending completion of heavy construction that would damage the roads or piping, provided that such arrangements would not unduly impair firefighting operations. Temporary signs shall be installed at each street intersection when construction of new roadways allows passage by motor vehicles in accordance with FC505.2.