I regret to inform you that it appears that I must resign from my position at XYZ Company, effective immediately.
Recently, an incident occurred resulting in the loss of my driver’s license for an extended period of time. Since driving is a key part of my job, I am unable to complete the work to which I am assigned.
I would welcome the opportunity to talk with you about what has happened and prevail upon you to consider me for other positions with XYZ Company. I enjoy working here, and believe that I can still be of value to the company.