Determination of the Appropriateness of Virginia's Retroreflective Sign Sheeting Specification for Fluorescent Orange Construction and Maintenance Signs

摘要

To ensure the safe and efficient movement of traffic through a highway network during nighttime conditions, traffic signs are either illuminated or made retroreflective. Since illuminating all highway signs is not practical or energy efficient, the majority of traffic signs are retroreflective. The Virginia Department of Transportation (VDOT) requires that retroreflective sheeting used on construction and maintenance activity signs be a fluorescent prismatic lens type capable of being retroreflective at entrance angles as great as 50 degrees with observation angles of 0.2 and 0.5 degree. Because the validity of the 50-degree entrance angle requirement was questioned, this research was conducted to determine if VDOT's specification is appropriate.