The Wanco Compact Radar-Speed Trailer with full-matrix display features the largest portable speed sign available today. The giant display shows vehicle speed in bold 26-inch characters, warning motorists to slow down by flashing their excessive speed. The trailer’s see-through design puts pedestrians and road workers in view, improving their safety — particularly in high-risk areas. The automated solar charging system provides long run times. Standard size sign-24"x30". Option for larger sign size-30"x36". Accessorie options- Touchscreen controller. Red/Blue or White flashers. Traffic Data Collection.