![Red light + green light = yellow light. Here's how it happens in the eye — and how to teach it. | by Elissa Levy | Age of Awareness | Medium Red light + green light = yellow light. Here's how it happens in the eye — and how to teach it. | by Elissa Levy | Age of Awareness | Medium](https://miro.medium.com/v2/resize:fit:330/1*o1eYmQ543ypOId3F3wYOOg.jpeg)
Red light + green light = yellow light. Here's how it happens in the eye — and how to teach it. | by Elissa Levy | Age of Awareness | Medium
![Traffic light. Red, yellow, green lights - Go, wait or slow, stop. International Traffic Light's Day. Applique Vector design illustrations. Stock Vector | Adobe Stock Traffic light. Red, yellow, green lights - Go, wait or slow, stop. International Traffic Light's Day. Applique Vector design illustrations. Stock Vector | Adobe Stock](https://as2.ftcdn.net/v2/jpg/02/11/92/67/1000_F_211926764_bOvuqSDvJjgAscBVzROcXDR8XwSDkokB.jpg)
Traffic light. Red, yellow, green lights - Go, wait or slow, stop. International Traffic Light's Day. Applique Vector design illustrations. Stock Vector | Adobe Stock
![Amazon.com: YXQ Industrial Signal Light DC 24V Red Yellow Green LED Alarm Tower Indicator Continuous lamp Warning Light with Buzzer : Industrial & Scientific Amazon.com: YXQ Industrial Signal Light DC 24V Red Yellow Green LED Alarm Tower Indicator Continuous lamp Warning Light with Buzzer : Industrial & Scientific](https://m.media-amazon.com/images/I/610WPn-1C7L.jpg)
Amazon.com: YXQ Industrial Signal Light DC 24V Red Yellow Green LED Alarm Tower Indicator Continuous lamp Warning Light with Buzzer : Industrial & Scientific
![Source 10 bar graph green yellow red 3 colors 10 segment customized led light bar display on m.alibaba.com Source 10 bar graph green yellow red 3 colors 10 segment customized led light bar display on m.alibaba.com](https://sc04.alicdn.com/kf/HTB1Zn62XIfrK1RkSnb4q6xHRFXa3.jpg)
Source 10 bar graph green yellow red 3 colors 10 segment customized led light bar display on m.alibaba.com
![Tower Light - Red Yellow Green Alert Light with Buzzer - 12VDC : ID 2993 : $27.50 : Adafruit Industries, Unique & fun DIY electronics and kits Tower Light - Red Yellow Green Alert Light with Buzzer - 12VDC : ID 2993 : $27.50 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/product-videos/1024x768/2993-03.jpg)