Assigned risk plans are facilities through which drivers can obtain auto insurance if they are unable to buy it in the regular or voluntary market.This is the most well-known type of residual auto insurance market and exists in every state. Drivers may not be able to purchase insurance in the voluntary market because of a driving/accident record or age. All admitted insurers that write auto insurance in the voluntary market participate in the plan and are assigned drivers to insure based on the percentage of the voluntary market held. For example, if State Farm has 20% of the voluntary market in a state and Allstate has 15% then State Farm will be assigned 20% of those drivers who cannot buy insurance otherwise and Allstate will be assigned 15%. (See FAIR Plans; Joint Underwriting Association; Residual Market).