The District's snow team treats bridges and roads in advance of forecasted weather. Crews are deployed throughout the city using a zone-based system. Plowing begians after one inch of accumulation, according to the city.

For more information, log on to the District Department Of Transportation's Web site.

Maryland State Police declare snow emergencies with input from the State Highway Administration. Once an emergency is declared, parking may be prohibited on snow emergency routes and snow chains or possibly tires may be required.

For more information, log on to the Maryland Department of Transportation's Web site.

Plowing generally begins after 1 and 3 inches of snow has accumulated.

Crews try to make roads "passable" within 12 hours of 3 to 4 inches of snow and within 18 to 24 hours of 5 to 7 inches.

"Passable," as defined by the county, does not necessarily mean roads will be plowed to bare pavement.

More information is available on the county's Web site.

The county is responsible for removing snow from more than 1,000 miles of roads.

As a storm starts, crews spread de-icing materials to keep snow and ice from sticking to the road surface. Depending on the severity of the storm, snow plows may also be used.

Roads are prioritized by three categories: primary (category A), secondary (category B) and residential (category C).

Crews first address primary roads, which are roads required for critical services like police, fire and ambulance crews. Once primary roads are cleared, crews move on to secondary, and finally residential roads.

For updates on snow removal progress, click here.

When it starts snowing, crews spread salt on all main county roads and emergency routes. When snow accumulates to three inches, plowing and salting crews continue to clear all main roads and emergency routes.

Snow crews focus first on keeping major county roads and primary neighborhood streets clear.

After the snow stops falling and after the major county roads and primary neighborhood streets are cleared, crews concentrate on clearing snow from all neighborhood streets and sanding as promptly as possible.

County officials said it takes about 16 hours to treat every county road once after a 3-inch snowfall.

For more information on snow removal, click here.

Report missed streets here.

Property owners are responsible for clearing their sidewalks, driveways and entrances within 24 hours of the end of a snowstorm.

During a snow emergency, residents should park in driveways. If on-street parking is necessary, parking is permitted only on the even-numbered side of the street.

When snow falls, snow emergency routes and primary roads are treated first. Once those roads are in "passable condition," crews will move onto secondary streets, then finally residential streets.

"Passable condition" is defined as: two treated lanes on primary roadways; one treated lane on residential streets.

County officials ask residents to wait 12 hours after the snow stops falling before they call the Snow Information Center at 301-350-0500 to report problems with the roads.

For more information on snow removal, click here.

The city's snow ordinance requires that property owners remove snow from sidewalks, steps, driveways, parking spaces and paved public use within 24 hours after a snowfall of 3 inches or less and within 48 hours after a snowfall of more than 3 inches. A path 36 inches wide must be cleared.

In addition, ice must be removed within 24 hours and surfaces have to be treated to prevent re-freezing. Violators can be fined $100 per occurrence.

Senior citizens or people with disabilities who need assistance with snow removal should call 240-314-8500.

More information is available on the city'sWeb site.

The Highway Department is responsible for conducting snow and ice control operations on approximately 1255 County-maintained roadways encompassing more than 565 centerline miles

Snow removal crews will work first to remove snow from the priority routes before moving on to the 23 residential and commercial routes.

The county uses rock salt, sand and calcium chloride in addition to snow plows. Snow accumulations of two inches or more require plowing prior to the application of salt.

Commercial and multi-family property owners are responsible for clearing sidewalks along their properties.

More information can be found on the county's Web site.

Three departments share snow removal responsibiltities for the city: General Services Recreation, Parks and Cultural Activities and Transportation and Environmental Services.

After a storm is over, crews try to clear streets in a reasonable amount of time, depending on temperature and road conditions. The goal is to clear less than four inches of snow within 12 hours of the storm's end and to clear 4 to 8 inches of snow within 24 hours of the end.

Business owners and residents are responsible for clearing sidewalks abutting their property within 24 hours after a storm has ended.

Click here for more information.

During a storm, snow crews concentrate only on keeping main arteries passable for public transportation and emergency vehicles.

A snow emergency may be declared if snow, sleet or freezing rain makes streets hazardous, as determined by the County manager. During a declared emergency, vehicles driven on snow emergency routes must be equipped with snow tires, M/S radials or chains.

Plowing generally begins when snow becomes two to four inches deep.

After clearing snow emergency routes, crews can then focus on arterials and bus routes. They also focus on roads to Metro stations, police stations and schools.

Residential streets are generally last. Those with steep hills are generally cleared first.

The county does not clear sidewalks.

During major storms, citizens can get a recorded update on the status of snow clearing operations by phoning (703) 228-6485

View county snow route maps.

Click here for more information from the county.

The City of Fairfax is responsible for clearing its streets of ice and snow.

The city's fleet of trucks aims to have city streets cleared within 24 hours of a storm, but extreme conditions may make the work take longer.

Residents can find out if a snow emergency has been declared by calling the city news recording at 703-273-1776.

A snow emergency is immediately in effect when three inches of snow accumulates on designated snow emergency routes.

Snow crews first try to clear primary routes, which include:

• Lee Highway (Routes 50 and 29)
• Chain Bridge Road (Route 123)
• Old Lee Highway
• Main Street (Route 236)
• Pickett Road (Route 237)
• Jermantown Road (Route 655)

In less than three inches of snow, crews spread salt on primary routes and a salt/sand mixture on other streets.

Plowing begins on primary routes after three inches of snow falls. Plowing won't begin on other roads until after the snow stops falling.

City officials say property owners are responsible for removing snow from sidewalks and driveways. Snow plows may accidentally push snow into private driveways, but it is illegal to push the snow back into the street. The property owner could be fined.

More information on city snow procedures is available online or by calling 703-385-7979.

The Virginia Department of Transportation is responsible for snow removal in Fairfax County.

VDOT does not salt roads prior to a storm. Officials believe salt is most effective after the snow has accumulated about an inch.

Snow removal focuses first on interstates, high-volume roads and emergency routes. Less-traveled roads and residential streets are cleared or sanded only after major roads are passable. Primary roads are numbered 1 through 599. Secondary roads carry number 600 and above.

VDOT's goal is to make all roads passable within 48 hours after a storm ends.

Road information is available through VDOT's Highway Hotline at 800-367-ROADS.

For answers to frequently asked questions, log on to Fairfax County's Web site.

The Virginia Department of Transportation is responsible for snow removal in Loudoun County.

VDOT does not salt roads prior to a storm. Officials believe salt is most effective after the snow has accumulated about an inch.

Snow removal focuses first on interstates, high-volume roads and emergency routes. Less-traveled roads and residential streets are cleared or sanded only after major roads are passable. (Primary roads are numbered 1 through 599. Secondary roads carry number 600 and above.)

VDOT's goal is to make all roads passable within 48 hours after a storm ends.

Road information is available through VDOT's Highway Hotline at 800-367-ROADS.

For more information, log on to VDOT's Web site.

The Virginia Department of Transportation is responsible for snow removal in Warren County.

VDOT does not salt roads prior to a storm. Officials believe salt is most effective after the snow has accumulated about an inch.

Snow removal focuses first on interstates, high-volume roads and emergency routes. Less-traveled roads and residential streets are cleared or sanded only after major roads are passable. (Primary roads are numbered 1 through 599. Secondary roads carry number 600 and above.)

VDOT's goal is to make all roads passable within 48 hours after a storm ends.

Road information is available through VDOT's Highway Hotline at 800-367-ROADS.

For more information, log on to VDOT's Web site.