SIGNS WITHIN WORK AREAS Barricades, vertical panels, cones, tubes, and drums are the most commonly used devices  to alert drivers of unusual or potentially dangerous conditions in highway and street work  areas. They are used to guide drivers safely through the work zone. At night they are often  equipped with flashing or steady burn lights.  Large flashing or sequencing arrow panels may be used in  work zones both day and night  to guide drivers into certain traffic lanes, and to inform the m that part of the road or street  ahead of them is closed.  Flagpersons are often provided in highway and street work  zones to stop, slow, or guide  traffic safely through the area. Flagpersons generally wear  orange vests, shirts or jackets,  and use red flags or stop/slow paddles to direct traffic thro ugh work zones.  TRAFFIC PROCEED TRAFFIC STOP 