Why streetlights on Milwaukee interstates, highways are purple

Marquette Interchange gets 'accent lighting

Do you know why some Milwaukee highway and interstate lights are purple?

Why Are Some US Street Lights Turning Purple? - Foundation for Economic Education

Crashes Still Slow Wisconsin Freeways, So Some Planners Push For 'Smarter' Roads

What is the deal with these blue street lights? : r/chicago

Do you know why some Milwaukee highway and interstate lights are purple?

Curved road night hi-res stock photography and images - Page 7 - Alamy

List of streets named after Martin Luther King Jr. - Wikipedia

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LED mystery: Why are some county streetlights turning bright purple?

Doraville looks to stimulate mixed-use development on Buford Highway - Atlanta Business Chronicle

1,646 Wisconsin Highway Images, Stock Photos, 3D objects, & Vectors

Why some streetlights are purple in Green Bay, Oshkosh, Wausau