General Motors' Maven and Lyft have signed up 350 drivers in metro Detroit for their Express Drive program, according to a report by the Detroit Free Press. The program allows Lyft drivers to rent used vehicles by the week rather than use their own vehicles on the job.

Launched in Detroit in late September, Express Drive is now available in 18 cities, including Chicago, Boston, Washington, D.C., Baltimore, Denver, Los Angeles, and San Francisco, Elliot Darvick, general manager of Lyft Detroit, told the Detroit Free Press.

Drivers can choose how long they want to stay in the program and can return their Lyft vehicle any time after giving 24 hours of notice, according to the report. Lyft drivers who complete at least 30 rides will only pay a weekly fee. But drivers with less than 30 rides per week will be charged 25 cents per mile, plus the weekly fee.

GM Spokesman Stefan Cross told the Detroit Free Press that an estimated 25% of Lyft rides in metro Detroit are provided by Express Drive vehicles.

Maven and Uber are offering a program similar to Express Drive only in San Francisco, says the report. Under the new Maven-Uber program in San Francisco, Uber drivers can rent the GM vehicles starting at $179 per week, plus taxes and fees. There are no extra fees for personal use of the vehicles.

Click here for the full Detroit Free Press report.