And, like most residents out there, the politicians don't realize that this is the root cause of the congestion problem on 66...
Not sure about root cause (were you posted to the D.C. area back when the restriction was HOV-3?) - but - there are enough of those HOV-exempt vehicles (along with the Dulles exemption) to really impact performance of I-66, when it should be running at free-flow.
Wasn't referring specifically to HOV lanes here. Using the Supervisor's words literally...their ability to "use 66" (regardless of whether HOV or not) is what drove massive hordes of population to Loudoun and western Fairfax, and is the "root cause" of 66 congestion.
Though a a pretty fair number of Loudoun County residents are not going to Arlington County or the District of Columbia.
I get the impression that plenty of them work along the Va. 267 corridor, or the Va. 28 corridor, or at the CIA complex on Va. 123 - often in jobs related to the "intelligence communty" which pay
very well and allow them to purchase McMansions in Loudoun County if they cannot afford a McMansion in Fairfax County.
There is also a fair amount of employment related to aviation in Loudoun County, most of which does not need I-66. Obviously at Dulles Airport, but also at the Federal Aviation Administration's Washington Air Route Traffic Control Center on Va. 7 (Harry Byrd Highway) just east of the Leesburg Bypass.