Last Friday, we all had a good laugh at the video of a man removing a mattress from a Metro bus. Was it strictly against the rules? We’re weren’t sure.

But today a Metro spokesperson directed DCist toward the “Tariff of the Washington Metropolitan Area Transit Authority on Metro Operations.” Specifically, the section on “baggage.”

Patrons may carry ordinary hand baggage and instrument cases, tool cases, folding baby carriages, wheelchairs, bundles, or packages which can be handled without inconvenience to other patrons. Such articles must not be permitted to remain in a position where they will interfere with entrance or exit, free use of the aisle, or the proper and safe operation of the vehicle. Patrons must remain with their possessions at all times. Unattended articles may be confiscated and/or destroyed for safety and security reasons.

So if your item is blocking free use of the aisle and inconveniencing other passengers, it shouldn’t be on the bus. Now if you get the mattress above your head — that’s another story.