Final answer:
Traffic signals displayed horizontally typically show the colors in the order of red, yellow, and green, from left to right. This arrangement corresponds with vertical signal lights and is designed for road safety and pedestrian protection.
Step-by-step explanation:
When traffic signals are displayed horizontally, the order of the colors from left to right is usually red, yellow, and green. The arrangement is consistent with the vertical placement of lights in a traffic signal where red is on top, yellow in the middle, and green at the bottom. The color red indicates a driver must stop, yellow is a warning or signal to prepare to stop, and green gives the go-ahead to proceed. Understanding the order of traffic lights is crucial for road safety, and helps control vehicle movement and ensure pedestrian safety at intersections.