Florida Learner's Permit Practice Test

Street signs are typically yellow in color because they provide a high contrast against the surroundings and are easily noticeable to drivers. Blue, green, and red are also commonly used in street signs but they have specific meanings and purposes. Blue street signs are used to indicate motorist services, green signs are used for directional guidance, and red signs are typically used for stop and prohibition signs. However, yellow is the most common and standard color for street signs.