RCW 46.72.060

Every person having a cause of action for damages against any person, firm, or corporation receiving a permit under the provisions of this chapter, for injury, damages, or wrongful death caused by any careless, negligent, or unlawful act of any such person, firm, or corporation or his or her or its agents or employees in conducting or carrying on said business or in operating any motor propelled vehicle for the carrying and transporting of passengers on any public street, road, or highway shall have a cause of action against the principal and surety upon the bond or the insurance company and the insured for all damages sustained, and in any such action the full amount of damages sustained may be recovered against the principal, but the recovery against the surety shall be limited to the amount of the bond.