Credit: Heavy traffic travels westbound on Interstate 66 in Fairfax County, Virginia, between the Capital Beltway and Nutley Street in this Aug. 24, 2016 file photo. (WTOP/Dave Dildine)

Maryland, Virginia counties top list of most expensive commutes in US

Some Metro riders could see more trains starting this summer

WATCH: Crews complete Purple Line tunnel dig

Metro to keep current hours

JetBlue adding more flights between Reagan National and Boston

Capital Bikeshare to expand electric bikes; dockless scooter companies push to raise speed limit