Photo: Annie Williams / Unsplash
Commuters heading into Washington, D.C. from Prince William County will have a new toll-free option this fall. The newly formed I-66 Slugging Network announced it will launch the I-66 Slugging Challenge on September 14, bringing organized carpooling, known locally as "slugging," to the I-66 corridor for the first time, with one of its two morning pickup points located at the University Boulevard park and ride in Gainesville.
Slugging is an informal, community-run form of carpooling that pairs drivers with passengers heading the same direction in real time, without scheduling or any exchange of money. Drivers who pick up enough riders can meet the occupancy threshold needed to use express lanes without paying a toll. On I-66, that threshold is three or more occupants (HOV-3), and vehicles must carry an E-ZPass Flex switched to HOV mode to ride free. The I-66 Express Lanes have run toll-free for qualifying carpools since the corridor was extended outside the Capital Beltway to Route 29 in Gainesville in 2022.
“As return-to-office trends continue and traffic congestion climbs, local residents are asking for the commuting alternative that combines speed, savings, and simplicity — called slugging,” said David LeBlanc, a longtime local slugging advocate and spokesperson for the I-66 Slugging Network. “The I-66 Express Lanes require HOV-3+ for free usage — but with slugging, drivers can meet that threshold easily while riders get a no-cost, no-hassle ride.”
The I-66 Slugging Network, a coalition of residential groups and public agencies, says pickup and drop-off points were chosen based on commuter demand, proximity to the express lanes, and access to backup transit. Along with the Gainesville park and ride, morning slug lines will also form at the Monument Drive garage in Fair Oaks, with drop-offs at four D.C.-area transit stations: Rosslyn, L'Enfant Plaza, Navy Yard, and Metro Center. Reverse slug lines are planned for the afternoon commute home.
To build a habit around the new routine, the network's 66-day I-66 Slugging Challenge runs from its September 14 kickoff, funded in part through incentives tied to logged trips. Commuters who register in advance at slugi66.com can track their trips and become eligible for prize drawings, including up to $1,000 in prizes; those who slug without registering can still ride free but won't be eligible for challenge prizes. The network says it will also point commuters toward complementary options such as the Commuter Connections Guaranteed Ride Home Program and Fairfax Connector bus service.
No exact September launch date for the slug lines themselves has been announced yet, though the Slugging Challenge is set to begin September 14. The Gazette will share details on the Gainesville pickup point as the network finalizes its schedule.
Source: The I-66 Slugging Network (press release, July 22, 2026) and slugi66.com.
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