Any person required to deposit security under RCW 46.29.070, for the benefit or protection of another person injured or damaged in an accident, shall in addition be required to give proof of financial responsibility for the future. The department shall give written notice of such additional requirement to every such person at the time and in the manner provided in RCW 46.29.070 for giving notice of the requirement for security.
RCW 46.29.420