An SR-22 is a certificate of insurance issued by an insurance company to prove that the carrier has sufficient insurance to cover losses - referred to as financial responsibility.
proof of insurance
To obtain your driver's license if you are convicted of an OWI, the Wisconsin Department of Transportation will require you to file proof of financial responsibility certifying that your insurance coverage meets minimum limits ($25,000 personal injury, $50,000 death, and $10,000 property damage).
non-commercial drivers
Non-commercial drivers can show proof of financial responsibility with an SR-22 certificate, which is issued by their insurance company. Alternatively, two other options may exist to show proof of financial responsibility: 1) a bond from an insurance company, or 2) by depositing $60,000 with the Department of Transportation.
commercial drivers
Motor carrier insurance can be shown as proof of financial responsibility for commercial driver's license.