Seattle and other cities have reversible freeway lanes, which run inbound in the morning and outbound in the evening. Seattle's reversible freeway lanes have gates and flashing lights to deter the inattentive from entering the lanes in the wrong direction.
Washington has carried the reversible-lane concept further: a sign a few blocks from the White House proclaims that the street is one-way for 2-1/2 hours on weekday mornings except holidays, and two-way at all other hours. The one-way/two-way (does that add up to three-way?) street has no flashing lights and no gates, only some yellow one-way arrows with a bit of text to indicate that most of the time the one-way street is actually a two-way street. It might be a delightful metaphor for the political logjam in Congress.