This report presents the original research conducted using a changeable message sign with radar at one work‐zone location in Prescott, Arizona, on State Route 89. In addition, findings from a previous extensive study of CMSR use conducted by the South Carolina DOT are reported in detail to compare and contrast its results with the original research in this study. The primary objective here was to investigate whether providing potential traffic fine feedback (in U.S. dollars) to drivers of speeding vehicles in a work zone changes their speeding behavior.