Insurance. Wondering how clearsurance determines scores for insurance companies to provide this list of the best auto insurance companies in illinois? Penalties and fines only go up the more driving without insurance convictions you rack up in illinois. These services collect information on all drivers from the insurance companies they have policies with, and publish that information on a database to help insurance companies find data on their applicants. The cheapest auto insurance we found after a dui is shown here, alongside the insurers' average rates for minimum coverage. Instead of settling for the first provider you find, consider doing some research to identify a few car insurance companies that have the coverage and discounts you are looking for. If the insurance agent quotes the premium incorrectly, the correct amount figured by the insurance company is the price you will actually be required to pay.