With two major transportation projects threatening to worsen Tysons Corner’s already abysmal traffic congestion, Fairfax County supervisors question whether the state has adequately planned for the convergence.

The Dulles Corridor Metrorail Project, which will run about four of its total 23 miles of new track through Tysons, and the Capital Beltway High Occupancy Toll Lanes project, which will add three new ramps to the area, are set to get under way at roughly the same time. While each of these projects could reduce congestion after their completion, local officials fret over how much they’ll add to bottlenecks during construction.