The construction of the Metro line to Dulles is prompting policymakers to look for ways to raise revenues.
New numbers show one-way rates on the Dulles Toll Road could triple to $6.75 by 2018 to bring in the funds necessary to pay for extending Metrorail to Dulles.
The Metropolitan Washington Airports Authority operates not only Dulles and National airports but also the toll road. It also oversees construction of Metro's Silver Line expansion. The tolls are a major source of funding for the multi-billion dollar project.
The current toll rate of $2.25 might need to double next year, though officials say they could use $150 million in promised funding from Virginia to stagger those increases over three years.