8:35 A.M. Update:

The accident on I-395 North at King Street has been moved to the shoulder and all regular lanes are now open. There are significant delays approaching this spot.

There’s an accident on Massachusetts Avenue at Observatory Circle in Northwest Washington.

Accidents have also been reported in Washington at 1st and M streets NW, 36th and N streets NW, Taylor Street and Harewood Road NE and in the 4500 block of South Dakota Avenue NE.

Participating in Car-Free Day? Let us know how your commute was in the comments below or on Twitter (@drgridlock). We want to know the traffic impact — were the roads emptier and buses and trains more crowded? Or was there no visible impact?

8:20 A.M. Update:

The traffic signals are reportedly flashing at 14th Street and Kalmia Road in Northwest Washington.

An accident at New York and Florida avenues could snarl traffic in that part of Northeast Washington.

There is also an accident at 16th Street and Whittier Place in Northwest Washington.

8:10 A.M. Update:

All lanes have reopened on Rockville Pike between Veirs Mill Road and Edmonston Drive

8 A.M. Update:

The accident on I-395 North at King Street now only blocking the right lane and right shoulder.

7:45 A.M. Update:

An accident on I-395 North at King Street is blocking the right two lanes. Expect heavy delays approaching this area.

The accident on I-270 South has been cleared and the lanes reopened.

7:20 A.M. Update:

Northbound Rockville Pike has reopened in Rockville between Veirs Mill Road and Edmonston Drive. Southbound lanes still remain closed as part of the accident investigation.

An accident on I-270 South after Shady Grove Road is blocking two lanes and one of the shoulders.

6:55 A.M. Update:

Main Street/MD 725 is open again in Upper Marlboro.

6:35 A.M. Update:

Scattered showers are expected throughout the morning and beyond, so expect some rain during your commute.

Original Post:

Good morning, commuters! It’s Car-Free Day, so almost 11,000 people have pledged to ditch the automobiles today. To take the car free or car-lite pledge, head to www.carfreemetrodc.com.

For everyone who is leaving the car at home, let us know how your commute goes. Did it take you more or less time to commute? Did you telework instead of going to the office? And for those of you who are driving, did you notice less congetion or traffic this morning? Tell us in the comments below.

We’ll be keeping an eye on the roads and rails this morning, reporting any delays or issues — and we will need your help: If you hear about any congestion, delays, problems or anything at all, tell us in the comments section below or by tweeting @drgridlock.

Road issues o far:

Rockville Pike is closed in both directions between Edmonston Drive and Veirs Mill Road in Rockville due to an accident investigation. This stretch is just south of the Rockville Metro stop and Rockville Town Square, so expect serious delays. Drivers who normally take this road should use I-270 or Georgia Avenue.

Main Street/MD 725 is closed between Upper Marlboro Road/MD 202 and Water Street in Upper Marlboro due to emergency roadwork. Drivers should use Pennsylvania Avenue to bypass this stretch and utilize U.S. 301 in place of Upper Marlboro Road.