The 16.2-mile Purple Line is roughly 80% complete

The project has faced criticism for going over budget and taking years longer than estimated — but could transform mobility in the region.

A map of the Washington, D.C. Metro region, showing where the future Purple Line light rail will run between Montgomery and Prince George's Counties in Maryland. The Washington Metro's Orange, Red and Green lines are also displayed with highlights where those lines intersect with the Purple Line.