A pedestrian waits near an Alexandria bus stop along Martha Custis Dr. on Jan. 30, 2017. (Photo by Matt McClain/The Washington Post)

Metro is planning to operate during regular hours Tuesday during the snowstorm, but it will run on a Saturday schedule, meaning fewer trains will be running. Metrobus will start the day on a “severe” modified schedule.

The rail system will open at 5 a.m. with headways of about 12 minutes at the ends of each line, and 4 to 6 minutes headways near the downtown core, officials said Monday.

“Running trains less frequently allows us to get out there and plow, and to do the other things we need to do to make sure the system is safe,” Metro General Manager Paul J. Wiedefeld said Monday afternoon at a news conference about snow preparations. ”

Bus service will continue to operate on some major thoroughfares, but other routes will be temporarily canceled in response to snow conditions. Details on those schedule and route changes can be found at wmata.com.

MetroAccess service was suspended at 4 p.m. Monday, and will remain so at least through the end of Tuesday.

Service schedules could change depending on the severity of the storm.

“Obviously if it isn’t as bad, we can put much more service out there,” Wiedefeld said. “The nature of this storm coming in the middle of the night — we don’t want our equipment getting trapped out there, and clearly we don’t want our passengers getting trapped out there.”

“We’ll continue to work very hard to provide as much service as we can as conditions change,” he added.

Metro also will continue to single-track trains on the Blue and Yellow Lines between Braddock Road and Huntington and Van Dorn Street stations as part of the current SafeTrack maintenance surge. However, there will be no shuttle buses operating between Franconia-Springfield and Pentagon stations.