This project will develop and implement a modified signal light unit, DynaSignal that is expected to significantly reduce the costs associated with the installation of additional mitigation strategies or the design of new large structures to mitigate such vibrations and the associated fatigue. The work will be performed through two stages. Stage 1 work will focus on creation of the field testing facility so that the long-term performance of the Dynasignal can be monitored and evaluated. To characterize the effectiveness of the DynaSignal, a specially designed traffic signal support structure will be designed with the following considerations: (1) the structure design will be such that it is prone to vortex shedding in low wind conditions and galloping in high wind conditions; and (2) the support structure would be oriented at several azimuth angles so that it can capture the most and moderately critical wind directions. To ensure that the prevalent wind directions align with the critical wind directions of the signal light structure, a rotating design will be adopted for the base plate of the foundation. The structure equipped with DynaSignal will be monitored to collect long-term data under different wind conditions. Work in Stage 2 will focus on preparation of the material for quick adoption and implementation of technology. Monitoring of signal structure will continue during this stage to capture different environmental conditions for a longer period of time. Life-cycle cost analysis will be performed to quantify the benefits of adopting the developed solution in practice. The fatigue life of the support structures with the modified signal light will be assessed and the life-cycle cost analysis results will be employed to demonstrate the long-term safety and performance benefits of the developed solution for the city and state transportation agencies. Presentations to the AASHTO T-12 committee as well as National Committee on Uniform Traffic Control Devices (NCUTCD) will be made and feedback from these committees will be used to refine design and preparing any research/methodology/ or guideline materials. The final report will The final report will provide all relevant data, methods, models, and conclusions along with guidance for state DOTs on how to implement the developed DynaSsignal system on their roads.