Updated at 9:04 a.m.

A pedestrian was fatally struck by a vehicle in Fairfax County on Tuesday, authorities said.

The accident happened along Lee Jackson Memorial Highway and Alder Woods Drive in Fairfax, according to police.

Police said the pedestrian was taken to a hospital and pronounced dead there. The pedestrian was later identified as Ralph Johnson, 63, of Reston.

Police said he was trying to cross the highway when he was struck by a Toyota Highlander. At the time he was hit, police said, Johnson was not in a crosswalk.

Officials said in a statement that neither “speed nor alcohol were factors for the driver.”

Some parts of the road were closed throughout the morning.

Original post at 6:15 a.m.

There were several traffic snarls during the early morning rush hour in the D.C. region.

In Maryland, a truck overturned on Interstate 270 south near MD-80 in Frederick County, causing backups of up to four miles.

In Northern Virginia, part of U.S. 50 West, also known as Lee Jackson Memorial Highway, was closed between Fair Ridge Drive and the Fairfax County Parkway after a pedestrian was struck by a vehicle. Fairfax County Police said the pedestrian was taken to a hospital with serious injuries.

Drivers are advised to avoid the area.

In the District, traffic was backed up along the inbound side of the Suitland Parkway near Stanton Road in Southeast Washington after a crash that involved an overturned vehicle. At least one person was hurt, officials said.

Traffic is backed up starting in Maryland near Silver Hill Road.

It’s not clear how long any of the delays will last.