Traffic in the D.C. and Baltimore region. (Google)

Rush-hour traffic was heavy in the D.C. region during the Friday afternoon rush as light snowfall arrived just in time to complicate commutes.

A crash on the Beltway’s outer loop before Interstate 270 caused delays in Montgomery County, according to  the Metropolitan Area Transportation Operations Coordination Program. All travel lanes were open, but backups remained.

Interstate 95 was also backed up in the Laurel area, where delays of up to 20 minutes were reported on the traffic app Waze.

Route 123 in Virginia was partially covered as road crews responded to clear the road, the Virginia Department of Transportation reported. Metro warned buses were delayed by about 25 minutes because of delays on Interstate 66 in Virginia.

The National Weather Service warned icy roads and sidewalks are expected through the night. Forecasters urged “abundant caution if you must travel.”

Capital Weather Gang's Jason Samenow breaks down Friday's snow forecast and how much to expect. (Jason Samenow,Claritza Jimenez/The Washington Post)

Temperatures were in the mid-to-upper 20s across the region. According to Capital Weather Gang, precipitation was expected to taper off between 4 and 5:30 p.m. from southwest to northeast in the D.C. area.