The role of guide sign to inform road user about the information of network is important.How to design and locate guide sign to increase traffic operation efficiency is a key point fortraffic engineers. Driving simulator is useful devise to study guide sign. Guide sign’s validityin driving simulator was studied. Results of this experiment are the foundation of furtherstudy on guide sign. Simulator calibration procedure for guide sign was set up in this study.Legibility distance as measure of performance was used to evaluate the validity of guide signin driving simulator. Thirty two participants were recruited. Results indicated legibilitydistance and speed was inversely related. Legibility distance and text height of guide sign waspositive related. When speed is 20km/h, 30km/h, 40km/h, magnifying power of text height is4.3, 4.1, 3.8, while guide signs are absolute validity in driving simulator.
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