Page 51 of the Rice Signs 2017 Traffic Safety Catalog details two specialty sign stand models. The RU3000 Dual-Spring Wind-Resistant Sign Stand uses two wind springs mounted at 45-degree angles for superior stability in high-wind work zones — the lower spring profile reduces the surface area exposed to wind, lowering the risk of stand tip-over compared to single-spring designs. The RU5000 Heavy-Duty Sign Stand features a foundation-grade base that provides additional ballast for the heaviest sign mounting requirements. Both stands work with the full Rice Signs sign inventory including roll-up mesh signs (36 in and 48 in) and rigid pole-up aluminum signs, and both can be paired with the RU6000 Sign Panel Holder accessory for rigid sign mounting.