Prominent red and white signs designate certain roads as snow emergency routes that are kept clear throughout storms for police, fire, and other emergency vehicles. Both the State of Maryland and Montgomery County have snow emergency routes and, by listening to news broadcasts, you can find out when a snow emergency plan has been declared. Note that the State and County do not always declare snow emergencies at the same time.

Main collector streets through subdivisions, such as Lamberton Drive, Dufief Drive, and Flower Hill Way.

All other side streets that are County maintained and are not designated as an emergency or primary route.