MetroAccess service will be suspended at 4 p.m. Monday and all day Tuesday.
The agency hopes to get ridesharing program for disabled and elderly customers rolling in March.
Derrick Lamont Bowen, 44, of SE Washington, was arrested on sexual-offense and assault charges.
The program, which provides $5 cab rides for the city's elderly and disabled, is being scaled back because it's outgrown its budget.
In a letter to Metro General Manager Paul J. Wiedefeld, officials say the app-based services have a history of not providing accessible service and Metro shouldn't reward them with a contract.
The transit authority is exploring alternatives to lower costs in its door-to-door service for people with disabilities-- and Uber is putting itself out there as an option.
Rail service is not yet affected, but Metro officials say they continue to monitor weather reports.
Regular service Christmas Eve, but Christmas Day will be like a Sunday.
Metro also announced schedules for other times during the holidays.
Metro board members support a pledge to riders, as transit officials describe service improvement programs.