This specification covers flexible white or colored, wide angle retroreflective sheeting (hereinafter called sheeting), tape and related processing materials designed to enhance nighttime visibility of traffic control signs and objects. Type IV Sheeting shall consist of High Intensity Prismatic lens elements encapsulated by a flexible transparent plastic that has a smooth outer surface. Type XI Sheeting shall consist of Full Cube Prismatic, or Full Cubed Prismatic Florescent Yellow and Florescent Yellow Green lens elements visible from the face of a smooth surface. The sheeting shall have a precoated adhesive protected by an easily removable liner.