Traffic signs are regulatory facilities that convey traffic information through graphic symbols and text, serving as legally binding guidelines for both vehicles and pedestrians. They fall into four main categories: directional signs, warning signs, prohibitory signs, and road guidance signs, each with strictly regulated colors and shapes. Directional signs, featuring white patterns on a blue background, indicate movement directions for vehicles and pedestrians. Common types include straight-ahead arrows, left-turn arrows, and right-turn arrows, such as those found on highway straight-through lane markings.
Warning signs with yellow backgrounds and black patterns (triangular or circular) serve as danger alerts, such as those indicating sharp bends, construction warnings, or pedestrian crossing alerts, helping drivers slow down. Prohibition signs featuring red backgrounds with white patterns (circular or octagonal) restrict or forbid specific actions, including left turns, honking, and parking to ensure road safety. Directional signs with green or blue backgrounds and white text provide route guidance and location information. Expressways typically use green backgrounds with white text for exit names and distance markers, while blue backgrounds with white text are commonly used for ordinary road guidance.