Section 12

in the case of street works executed under section 11, of the several frontagers listed in the final apportionment as together have an annual value of more than fifty per centum of the total annual value of the premises so listed; or

in any other case, of the several frontagers of such private street or part of a private street as together have an annual value of more than fifty per centum of the total annual value of the premises fronting on, adjoining, abutting on or

(though not actually so fronting, adjoining or abutting)

adjacent or accessible to such private street or part of the private street, as the case may be, demanding that the private street or part of the private street be declared a public street, the local authority shall declare the same to be a public street and such street shall thereupon become a public street and forever afterwards be maintained by the local authority.

The declaration shall be published in such manner as the local authority thinks fit.

Private streets may be declared public streets