Va. Code § 46.2-1310
The chief of police of any county, city, or town, or the sheriff of any county which does not have a chief of police, may deputize persons over the age of eighteen years for the limited purpose of directing traffic in accordance with § 46.2-1309 during periods of heavy traffic or congestion. Such persons shall first receive training as the chief of police or sheriff determines necessary to fully acquaint such persons with the techniques of traffic control. They shall not have arrest powers.
Any person who is deputized as provided in the foregoing provisions of this section, shall at all times while engaged in traffic control wear a distinctive uniform, safety vest, or a white reflectorized belt which crosses both the chest and back above the waist.
Va. Code § 46.2-1310