A transit advocacy group filed a $1 billion injunction in Fairfax Circuit Court Thursday against a plan to create high-occupancy toll lanes along the Capital Beltway and the Interstate 95/395 corridor.

The Metro Area Mass Movement Association, which leader Brent Reynolds said has 1,500 members, argues that Fluor-Transurban’s plan does not properly take into account the environmental impact of the highway widening projects. It asks that all tree-cutting and land clearing be stopped until the companies answer additional questions.