Improving motor carrier safety measurement : panel on the review of the Compliance Safety and Accountability (CSA) Program of the Federal Motor Carrier safety Administration : a consensus study report of the National Academies of Sciences Engineering and Medicine Summary Introduction Overview evaluations and criticisms of the safety measurement system Applications of item response theory models in other contexts and public release and transparency Applying item response theory models to highway safety Extensions of and implementation of the item response theory model to the safety measurement system Data availability and quality Introduction Overview evaluations and criticisms of the safety measurement system Applications of item response theory models in other contexts and public release and transparency Applying item response theory models to highway safety Extensions of and implementation of the item response theory model to the safety measurement system Data availability and quality