It depends on which state you are in, but they are usually green with white lettering.
Green traffic signs usually indicate directions. Exit and Entrance signs for the expressway, distances to cities and towns, mile markers, etc.
A road leading off the expressway is typically an exit ramp that allows vehicles to leave the high-speed thoroughfare and access local roadways or destinations. These exits often have designated signs indicating upcoming exits and may include a deceleration lane to safely reduce speed. They connect drivers to various areas such as towns, businesses, or service facilities.
Signs that indicate an unripe grapefruit include a greenish color, firm texture, and a lack of sweetness.
Signs that indicate an unripe orange include a firm texture, greenish color, and a lack of sweetness or juiciness.
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Regulation or regulatory signs are the signs along the highway that are black and white in color. Think of speed limit signs. These signs indicate a law or regulation, whereas yellow signs are cautionary signs. They indicate a possible hazard or danger. Brown signs or green signs are generally information, blue indicate travel services or accomodations.
Signs that indicate a ripe mangosteen include a deep purple color, a slight give when gently pressed, and a fragrant aroma.
Guide signs are large Rectangular green signs with white lettering that indicate distance and route direction. "A"
If you miss the exit ramp
Signs that indicate an unripe mango include a firm texture, green skin color, lack of sweet aroma, and sour taste.
Green traffic signs usually indicate directions. Exit and Entrance signs for the expressway, distances to cities and towns, mile markers, etc.