Starting next week, major lane closures will likely cause significant delays at Reagan National Airport. The bright side? With them will come temporary, limited free parking in airport garages.

Weather permitting, the two left lanes of the general roadway in front of Terminal B/C will close starting Wednesday, March 21, the Metropolitan Washington Airports Authority said. The closure is expected to last about a month before the work zone shifts.

The closures, which will last for the next year or so, are part of the construction of new security checkpoint areas above the roadway between the Metro tracks and the existing terminal. Major construction impacts on the airport’s roads are expected to last until the new building supports are in place and the 50,000-square-foot structures are fully enclosed next year. The new checkpoints are scheduled to open in 2020.

Starting Wednesday, the airports authority will allow free parking in Reagan National’s garages for up to 60 minutes in an effort to move some pickups and waiting drivers out of the regular traffic lanes. After 60 minutes, the regular rate of $6 per hour will apply.

The airport also suggests using Metro to reach the airport when track work and service hours allow for it.