Two lanes of southbound Rockville Pike have reopened, but one remains closed.
Signal problems on Metro's Orange Line are causing delays.
It might be HBO's "The Plot Against America," based on a Philip Roth novel.
Montgomery officials say traffic relief is most needed in northern section, but the environmental study for that portion is further behind.
A track problem had caused Metro to suspend service on the Blue, Orange and Silver lines for about an hour.
Drivers should expect delays in the region due to flooding in parts.
Two lanes along I-66 east are blocked after a crash.
The June 19 will be the second held by the House Transportation and Infrastructure Committee, which is conducting its own investigation into the FAA's process for certifying the Boeing jet.