I need to take a drivers ed course, but need a sign language interpreter... No one will provide one . How can I enforce it or get someone to help me.

It is not clear to me that the businesses with which you are dealing have any legal duty to provide an interpreter. Under Title III of the ADA -- and assuming that the businesses in question constitute "public accommodations," which is not itself certain -- they must merely provide you with appropriate aids and assistance, not the particular assistance you demand. As I am sure you are only too painfully aware, many small businesses are unaware of the requriements of Title III, and many of them find compliance with these kinds of regulations too burdensome. Indeed, under the ADA, they need not comply with the "assistance" requirements of Title III if doing so would "fundamentally alter" their services. They may have a reasonable argument that sign-assisted driver ed would be a "fundamental alteration" of their services. It might take you years and thousands of dollars to litigate this question to a successful conclusion. To be blunt, the quickest route to the goalpost for you will be to hire your own sign interpreter. If you are unable or unwilling to do so, it may be years before you get relief from the judicial system. You can, if you wish, file a complaint with the Civil Rights Division of the Justice Department. Sometimes, life is just unfair. This may be one such occasion.