WASHINGTON — As Metro continues with its extensive and disruptive maintenance plan, construction crews have been making progress as they work on a different project — extending the Silver Line.

Six new stations along the extended line are being built to serve areas of Reston, Herndon, Dulles Airport, and eventually ending in Ashburn.

“I don’t see any major hiccups in the construction,” said Charles Stark, executive director of the rail project.

Stark gave an update Wednesday to the Metropolitan Washington Airports Authority Board of Directors.

“Innovation Station is the furthest along right now,” said Stark. “We’re installing precast panels that will form the platform.”

The Innovation Center station is being constructed in Fairfax County in the median of the Dulles Toll Road and the Airport Access Highway near the interchange with Virginia Route 28.

“Following Innovation is the Herndon Station where they’re pouring walls and getting ready to start the precast panel installation,” said Stark.

“The Dulles Station is also well underway,” he said.

Additionally, construction on the Reston Town Center Station is ongoing and is expected to tie up traffic this weekend. From Friday night through Sunday afternoon, traffic will be periodically disrupted along the Airport Access Highway between the Fairfax County Parkway and Reston Parkway overpasses as crews assemble a crane in the median.

All of this construction work is known as phase two of the Silver Line project.  Phase one, which runs from East Falls Church with four stations in Tysons Corner and one in Reston, opened in July 2014.

People should be able to ride trains through the six new stations by the year 2020.