Transportation planners are mulling over how to manage two enormous construction projects that could get under way at roughly the same time in Tysons Corner, a convergence that threatens to further bottleneck an already traffic-choked area.

The Dulles Corridor Metrorail Project will, under the governor’s current plan, bring a massive elevated track across Routes 123 and 7, which many fear will exacerbate the Tysons traffic nightmare. The Tysons Corner portion constitutes about four miles of a total 23-mile expansion of Metro to Dulles Airport.