A Discrete-Time Epidemic Model to Analyze Impact of Age and Gender Targeted Interventions

A retro-reflective sign is provided having a front face member attached to a back member. The face member has a plurality of cube corners disposed along its back surface. The sign can be of any shape or color and provides superior light reflection at night as compared to conventional signs. Thus, the sign can be easily seen while driving at night. In an alternative embodiment, the cube corners are disposed along the inner surface of the back member. The front face member or the entire sign can be coated with a silicone material to provide added protection to the sign from scratching and vandalism. A side wall can be provided between the front face member and the back member to define a gap area therebetween. Several sign to a post attachment embodiments are also provided.