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Understanding and Mitigating the Dynamic Behavior of RICWS and DMS Under Wind Loading

Status:  Complete
Report Date:  07/06/2020

Summary:

Research showed that dynamic message signs (DMS) with breakaway components handle wind-induced vibrations adequately for a 23.8-year fatigue life. The roadside installations remain an economical alternative to overhead DMS. Rural intersection conflict warning signs (RICWS) vibrate noticeably under wind forces. The breakaway base sleeves diminish post stiffness, and the signs are not heavy enough to manage wind stresses well. MnDOT is considering using a single tube of steel or aluminum for support posts.

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