Neither the city nor any officer thereof shall be held liable for the pecuniary responsibility or solvency of any insurer under the provisions of this subchapter, or in any manner become liable for any sum on account of any such claim or act or omission relating to the insured vehicle, nor shall the liability of the owner of any such vehicle be in any manner limited or changed by reason of the provisions of this subchapter, but the judgment creditors having causes of action secured thereby shall be authorized to sue directly on such policy of insurance without impleading the city, and all persons known to any insurer to have been injured or damaged in the same accident and claiming damages thereunder may be made parties without priority of claim on payment in any suit had or instituted on account of such matters.
('68 Code, § 35-48)