Passengers and workers on all forms of transportation should always wear masks to prevent the spread of COVID-19. The “strong recommendation” in the latest guidance from the Centers for Disease Control and Prevention includes anyone traveling via airliners, trains, subways, buses, taxis and ride-share vehicles.

The interim guidance also calls for facial coverings at transportation hubs like airports and train stations.

“Broad and routine utilization of masks on our transportation systems will protect Americans and provide confidence that we can once again travel more safely even during this pandemic,” the CDC said.

Studies have found that wearing masks, combined with constant cleaning, make up an “essential” protocol for safe travels. Masks have already been mandated by major air carriers. In addition, most airports, Amtrak and the majority of public transit systems already require all passengers and workers to wear facial coverings.

Masks are also required by many private transportation providers, including ridesharing companies Uber and Lyft.