The local bus system will also begin boarding from the front door instead of rear door entry, another move that was undertaken to limit the spread of the novel coronavirus.
The move comes as doses of two vaccines produced by Moderna and Pfizer are delivered in Virginia and throughout the country to front-line health care workers and individuals in long-term care facilities.
Metro will also begin resuming the collection of bus fares on Jan. 3.
In order to maintain protect passengers and bus operators, the county has installed polycarbonate driver shields on buses. Face coverings continue to be mandatory inside buses.
Since May, staff has given 66,000 face coverings to passengers without masks. Passengers are encouraged to practice social distancing when possible, stay at home if they are sick, and wash hands often with soap and water.
Transdev, the bus systems operations continue, continues to step up cleaning and disinfecting of bus interiors and commonly used areas like door handles and handrails, according to the county.