Waits of 16 minutes or more will affect everybody on the Metro system this weekend.
Scheduled track work will affect all five of Metro's rail lines this weekend.
Starting at 10 p.m. Friday night and then on through the weekend, trains on the Orange, Blue, Yellow and Green Lines will run once every 20 minutes, so riders may encounter a longer than usual wait on the station platform.
On the Red Line, trains will run from end to end once every 16 minutes all weekend, although extra trains running between Shady Grove and Union Station will make the interval between trains more like 8 minutes through that stretch from 9 a.m. to 9 p.m. both Saturday and Sunday.
The planned work is all part of Metro's six-year, $5 billion Capital Improvement program, and looking ahead, the transit agency has updated its calendar of major track work over the next six months.
A list of dates and areas affected is available on Metro's website.