Update, 9:27 a.m.:

Falling ice is blocking traffic in the westbound lanes of the Bay Bridge. Only the left westbound lane is getting by.

Other weather-related incidents include: A vehicle slid off the George Washington Parkway at Turkey Run Monday morning. Downed wires fell on a bus on Goshen Road at Centerway Road around 6:30 a.m., according to Montgomery County Police. No information was available about injuries in either incident.

Authorities continue to urge drivers to use caution on the roads.

Update, 8:43 a.m.:

At least two people were critically injured in a crash possibly related to weather in the Glenn Dale area of Prince George’s County Monday morning, authorities said.

Mark Brady, a Prince George’s County Fire/EMS Department spokesman, said firefighters had been busy with crashes, downed wires, and other snow-related issues, especially in the northern section of Prince George’s County. 

Update, 8:20 a.m.:

An overturned vehicle is causing delays on northbound George Washington Parkway before Route 123 in Virginia. Only the left lane is getting by.

Original post: 7:49 a.m.:

It may look like a winter wonderland outside, but Monday morning’s “boom” of snow is causing traffic and travel headaches throughout the region.

snowplowalexandria A snow plow idles in the Urbana park-and-ride in southern Frederick County. Roads in the area are mostly slushy and well-treated with salt. (Jonathan Forsythe — The Washington Post

Wet, heavy snow combined with low visibility is making for a slow, messy commute.One to three inches have accumulated on parts of I-95 and I-270 as well as secondary roads, but so far, no major accidents have been reported.

PHOTOS: Region wakes up to a winter wonderland

Snow trucks are treating roads, which are slick and slushy in many areas. Drivers are urged to use caution, especially at pedestrian crosswalks, and to allow extra time for travel this morning.

Air travel is also expected to be impacted by the unseasonable wintry weather. According to the Metropolitan Washington Airports Authority, runways are open at Reagan National and Dulles International airports, and snow removal teams are on duty at both airports. Travelers are encouraged to check directly with airlines for delays and cancellations.