Over the last few years, D.C.-area drivers may have noticed the continual increases in toll fares on the Dulles Toll Road, the highway going through the Northern Virginia suburbs past Dulles Airport. Indeed, since 2005, the toll for the typical round-trip commuter has more than quadrupled from $1.50 to $7.00, with more increases coming. These extra toll dollars haven’t been going for upkeep or expansion of the highway, however, but instead have been funding the over-budget and under-performing construction of the Metro’s Silver Line extension. While originally slated to fund only 25% of that cost, commuters are now looking at paying more than half of the $5.6 billion (and counting) total cost, with years of construction still to come. The entity in charge of the construction project (and of gouging the toll road’s commuters) is the Metropolitan Washington Airports Authority, a public body established to govern Dulles and Reagan National airports at the behest of the Department of Transportation. But who’s actually in charge of the MWAA, and to whom can beleaguered commuters turn for relief? Although created by an interstate compact between D.C. and Virginia, the MWAA was granted all of its authority by an act of Congress, and the highways and airports that it oversees are federal property. In many ways, the MWAA acts like a federal agency—in nearly all ways, in fact, except one important aspect: oversight. If federal assets and lawmaking power are being delegated to the MWAA, then there must be a means for the executive branch to “take care that the laws be faithfully executed.” The MWAA, however, is governed by a board of individuals whom the president has no meaningful ability to appoint, oversee, or control. This means that the MWAA has no political accountability for its decisions. Having no other meaningful recourse, a group of Dulles Toll Road users sued the MWAA, arguing that its decrees violate the separation of powers. The federal district and appeals courts—two of them, in an unusual development whereby the Federal Circuit transferred the case to the Fourth Circuit—decided that the MWAA’s nature as a state-created entity required the case to be dismissed. Moreover—get this—because the MWAA has no meaningful executive-branch control, there is no separation-of-powers issue. (This despite the federal government’s appearance as an amicus to argue that the MWAA exercises federal power and is subject to separation-of-powers scrutiny.) Undeterred, the plaintiffs have petitioned the Supreme Court to hear their case. Cato has joined the American Highway Users Alliance and the Recreation Vehicle Industry Association on a brief supporting their petition. We argue that the Court should take the case because (1) there is a critical violation of the separation of powers, (2) there are already manifest harms resulting precisely from that violation, and (3) the federal government sees and treats the MWAA as a federal agency—but one without any meaningful accountability whatsoever. It isn’t every day that a separation-of-powers case is as squarely presented as it is here, where commuters are being railroaded, so to speak, by a runaway agency whose conductor is absent. The executive branch has to take the blame not only for the MWAA’s policies, but its corruption, incompetence, and mismanagement.