# Traffic Light Yellow Borders Explained

> Yellow borders on traffic lights improve night visibility and safety during outages.
- Title: Traffic Light Yellow Borders Explained · Family Handyman
- Summary: Yellow borders on traffic lights improve night visibility and safety during outages. Yellow reflective borders around traffic lights enhance nighttime…
- Keywords: traffic light, reflective border, federal highway administration, backplate, power outage, road safety, Traffic, Light, Yellow, Borders, Explained, Family Handyman
- Source: Family Handyman — https://familyhandyman.com/article/traffic-lights-borders
- Author: Alex Shoemaker
- Published: 2026-10-14T21:01:34+00:00
- Read time: 1 min
- Topics: traffic light, reflective border, federal highway administration, backplate, power outage, road safety
## What Yellow Reflective Borders Mean
Yellow borders around traffic lights are reflective strips attached to black backplates that catch headlights for better nighttime visibility.

> This treatment is recognized as a human factors enhancement of traffic signal visibility, conspicuity, and orientation for both older and color vision deficient drivers
## Safety During Power Outages
The borders provide a visible stop cue for drivers during power outages when traffic lights would otherwise be dark.

> This countermeasure is also advantageous during periods of power outages when the signals would otherwise be dark, providing a visible cue for motorists to stop at the intersection ahead
## Safety Benefits
A 2005 study found yellow reflective borders reduced crashes at intersections, making them a proven safety measure.

> A 2005 study found that adding yellow reflective borders reduced crashes at the intersections researchers examined
## Why Not All Traffic Lights Have Borders
State and local agencies decide where to install yellow reflective borders based on visibility needs and cost considerations.

> Federal traffic safety standards allow yellow reflective borders, but don’t require them at every intersection
## Key takeaway

Yellow reflective borders around traffic lights enhance nighttime visibility and provide a visible stop cue during power outages.