Why select us
Nanjing Gaoqiao Traffic Technology Co., Ltd
NJGQ has 17 years history in traffic light design and making since 2006, we also have partnered with Siemens (China) since 2016.Our focus and advantages are: traffic light & traffic light controller, whether it is normal power or solar power, portable or mobile, normal or solar warning traffic light, all kinds of traffic signal board, as well as light poles
Explore page
Why Traffic Lights Use Red, Yellow, and Green Colors
date:2026-03-10 10:06:41
Why Traffic Lights Use Red, Yellow, and Green Colors
Traffic lights rely on red, yellow, and green for safety, visibility, and universal recognition. This color combination is not random—it follows human vision, light physics, and global traffic standards.
Red has the longest wavelength and strongest penetration through fog, rain, and dust. It is easily visible from far away and naturally signals danger, so red means STOP.
Green represents safety and calm. It contrasts clearly with red, giving drivers a clear signal to GO.
Yellow acts as a warning and transition between red and green. It alerts drivers to slow down and prepare to stop, improving safety at intersections.
These three colors are easy to distinguish for most people, including those with color vision differences. Supported by long-standing traffic rules, red-yellow-green has become the worldwide standard for traffic signals.
Always On Your Way, Always Protect You! Top Chinese Traffic Light Manufacturer: NJGQ
ur focus and advantages are: traffic light & traffic light controller, whether it is normal power or solar power, portable or mobile, normal or solar warning traffic light, all kinds of traffic signal board, as well as light poles.