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An advance-warning flasher alerts drivers of the imminent onset of a yellow light at a signalized intersection, and it is widely used to reduce crash frequency and severity. Recently, a more-aggressive countermeasure, a speed-limit reduction, is being used at high-speed signalized intersections in addition to advance-warning flashers. In this paper, six high-speed intersection approaches in Nebraska were evaluated to assess the operational effects of no speed-limit reduction, an () speed-limit reduction, and a () speed-limit reduction in the vicinity of high-speed signalized intersections equipped with advance-warning flashers. The placement of speed-limit-reduction signs resulted in significant reductions in observed speeds only when upstream drivers were traveling at speeds higher than a comfortable range—1.8 to (1.1 to ) higher than the regulatory speed limit. The likelihood of this …