Safety impacts of signal-warning flashers and speed control at high-speed signalized intersections

► Combined crash-mitigation effectiveness of speed-limit reductions and traffic signal warnings is studied. ► Random parameters negative binomial and nested logit models are used. ► The effect of a 5 mi/h speed-limit reduction with signal-warning flashers is ambiguous. ► But a 10 mi/h speed-limit reduction with signal-warning flashers unambiguously decreases the frequency and severity of crashes.