In such a dangerous field with possible safety issues, construction workers need high-visibility safety gear from head-to-toe ...

Originally, California’s road signs were black with white lettering, but the state changed them after a federal rule was ...

Abstract: A novel wideband ultrathin planar retrodirective metasurface (RMS) is proposed. The structure is composed of anisotropic wideband retrodirective unit cells (WRUs), achieving retroreflection ...

Retroreflection increases signs’ visibility because it reflects light directly back in the direction it came from. Caltrans began phasing in retroreflective signage in 1999. The image on the ...