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Gray: An RRFB should not be considered. Low risk to warrant RRFB installation due to low speeds, narrow roadways, and/or lower traffic volumes. <br />Green: An RRFB should be considered in conjunction with other countermeasures (e.g., curb extensions, medians, lighting, etc.). <br />Red: An RRFB should not be considered. High risk to warrant RRFB installation due to high speeds, wide roadways, and/or high traffic volumes. <br />MnDOT STEP Chart