Look for bright colors. Warning signs on the highway will have bright yellow and orange backgrounds.
Examine the shapes. Common warning signs on the highway come in either diamond or square shapes. These shapes relate information to protect the driver from unforeseen circumstances.
Read the message. "Right Lane Ends," "Construction Zone," "Road Narrows," and "Slow Traffic Ahead" are among many written statements to tell drivers how the road and traffic will change ahead. Read these signs and use caution when entering a different traffic pattern.
Study the symbols. Some warning signs have simple pictures to relate road conditions and hazardous areas. Look for curved arrows that indicate a possible road shift or merger. Construction signs will show images of people working or flagging traffic to slow down. Reduce speed to avoid injury.
Find the shape. Interstate highway route markers have a triple-pointed shield shape. Alternative or special route signs have a rectangular shape.
Notice the number or arrow. Routes are categorized by a number system throughout the United States. Use a map in conjunction with highway signs to help direct you in the right location.
Look for symbols. Directional signs with a large "H" letter indicate a hospital is nearby. Fork and knife images tell drivers that restaurants are close. A gas pump image shows drivers where to refuel.