Warning lights on channelizing devices
South Carolina has discontinued the use of warning lights on drums and has drastically limited their use with Type II barricades. The high-intensity reflective sheeting is much brighter than warning lights. However, SCDOT still requires warning lights on advance warning signs and Type III barricades in areas where they are closing a previously active roadway, e.g., bridge replacement.
On typical widening jobs with drainage structure excavations, SCDOT requires two Type II barricades supplemented with a Type A flashing warning light at each excavation. These are the only instances where warning lights continue to be used. Also, there is the concern regarding NCHRP Report 350 crash approval and ensuring the contractor uses the correct lightweight warning lights.
As reflective sheetings continue to improve, it decreases the need for warning lights.