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This study aims to propose a set of procedures to establish the optimum speed limit reduction to be deployed at freeway work zones across Iowa. These work zones are classified as traffic critical work zones by the Iowa Department of Transportation due to their high average annual daily traffic, potential to cause major traffic hindrances and delays in the event of an incident, and presence of state border bridges. Due to the severe impacts these work zones pose on the operating traffic, it is imperative to quantify the safety risk associated with such construction operations both from the standpoint of crash frequency, as well as total damage incurred, in other words, crash severity.