A sign Washington-area Metro station dictates that face coverings are mandatory for anyone to ride on the public Metro and Metrobus. (Daniel Slim/AFP/Getty Images)

As the Washington Metropolitan region takes its biggest step yet toward reopening, Metro plans to keep service limited — but will adjust if demand for rides exceeds the transit agency’s expectations.

“Even though things may start to open, what the demand side looks like could be totally different than what’s open,” Metro General Manager Paul J. Wiedefeld said Thursday. “So we’ve got to see how that plays out.”