Rockville Pike was shut down in both directions through Tuesday morning's rush, but reopened shortly before midday.
The closure was at the intersection with Hubbard Drive due to downed wires.
Drivers were told very early Tuesday morning to expect significant delays and seek alternate routes.
Cars were backed up on southbound Rockville Pike for a mile just before the intersection with Hubbard Drive at 8 a.m. The delays were not as significant on the northbound side.