While I'm not admitted to law practice in your state, my understanding of the law is that no convictions for traffic offenses may be set aside or expunged. At this point you should consult directly with a local criminal law attorney. They can best explain your rights/remedies under the circumstances. In the meantime, here is a site that you may find to be of help:http://www.oregon.gov/OSP/Pages/id/expungement.aspx