If (as I presume) the zoning and/or parking laws in your municipality do not allow parking in your backyard, then while you can petition the city (e.g. at town council meetings; through the mayor's office; etc.) to change the rules or allow an exception, you cannot compel them through a legal action: there is no legal requirement to alter their zoning or parking ordinances because of the personal circumstances of a single citizen. The fact that you have a combination of disability and inability to pay for a driveway does not give you a right to park in your backyard.