Atlas Arteria’s attempts to raise toll fares by as much as 40 per cent for cars using the Dulles Greenway near Washington have hit a roadblock after officials in the United States recommended against the increase.

The ASX-listed company, which owns toll roads in North America and Europe, asked regulators last year if it could lift fares on the Dulles Greenway, a 22-kilometre toll road that takes drivers from the historic town of Leesburg towards the US capital.