Car-sharing services Zipcar and Flexcar have gained a large customer base in Washington over the last two years, ever since the city agreed to give the companies more spaces to park their vehicles. The extra vehicles have led to more carless city dwellers taking advantage of the competing services’ short-term car rentals to get their errands done — something the city was happy to help facilitate, in the hopes of encouraging more residents to give up keeping private vehicles and reduce traffic congestion. But WTOP’s Hank Silverberg tips us off that the parking deal with the District has put the city government in the line of fire of a new discrimination lawsuit.

A disabled D.C. resident is suing under the Americans with Disabilities Act after both Flexcar and Zipcar refused to provide her hand controls so that she could operate one of their rental vehicles. The D.C. government is also being included in the lawsuit because of its parking deal with the two companies.

Portable hand controls that can be installed in any vehicle run between $400 and $500, and allow disabled people to operate the gas and brake pedals of a standard car with their hands.