A paper titled “Meta-regressions of exposure parameters used in spatial road safety analyses, September 2020” authored by Apostolis Ziakopoulosand is now published in Advances in Transportation Studies. The objective of this paper is to obtain quantitative estimates that several study characteristics impose on the values of their coefficients applying meta-regression techniques to three common exposure parameters (traffic volume/AADT, roadway length and vehicle distance traveled). Results indicate that the impact of traffic volume on crash counts was positively correlated with taking speed limit and road user age into consideration in spatial analyses, while the impact of road length on crash counts in spatial analyses was found to be higher in studies considering only fatal crashes. doi