A paper titled “Meta-analysis of the effect of road work zones on crash occurrence” authored by Athanasios Theofilatos, Apostolos Ziakopoulos, Eleonora Papadimitriou, George Yannis, and  Konstandinos Diamandouros is now published in Accident Analysis and Prevention. This paper presents formal meta-analyses of studies that have estimated the relationship between the number of crashes and work zone duration and length, in order to provide overall estimates of those effects on crash frequencies. All studies presented in this paper are crash prediction models with similar specifications. Meta-regression findings indicate that the main factors influencing the overall estimates of the beta coefficients are study year and region for work zone duration and study year and model specification for work zone length.