Arrow panels and portable changeable message signs are often used in work zones to inform drivers of the need for a lane change or caution. The "Manual on Uniform Traffic Control Devices" (MUTCD) requires that Type C arrow panels have a minimum legibility distance of 1.6 km (1 mi). However, the MUTCD does not provide a subjective means for determining whether an arrow panel meets this criterion. Nor are there industry photometric standards for message panels. The purpose of this project is to develop a reliable and repeatable objective method for measuring the photometrics of arrow and message panels to ensure adequate performance. The research project tasks include a review of the state of the art, reviews of existing pertinent specifications, development of initial test methods, evaluations of arrow and message panel visibility and the effectiveness of the test methods, revisions and modifications of the test methods, and documentation of research activities and findings. The research findings will be described in a research report and a project summary report. The recommended test methods will be included in both documents.