Update at 10:30 a.m. — The heavy traffic is starting to clear out, with delays now starting somewhere between Spout Run and Ballston.
It’s very slow-going on I-66 this morning. The westbound lanes are currently backed up from Rosslyn to Great Falls Street due to an accident.
The accident was earlier reported to be blocking two lanes just before the Dulles Toll Road. Significant delays remain.
The backups have spilled onto local streets, as well. Arlington police have reported a long line of cars on Fairfax Drive at the I-66 on-ramp.