Last week, Virginia passed yet another extension of its hybrid HOV law, which gives drivers of “clean fuel” vehicles access to the commonwealth’s carpool lanes. The law has been extended annually since its original expiration date in 2006—even as the state’s HOV lanes (and hybrid sales) swell. Could the extensions have anything to do with the fact that, with every registration for access, $15 goes to the state police’s “HOV Enforcement Fund?”