The Stop Sign Wasn't Always Red - The New York Times
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Stop Signs Were Yellow Until the 1950s — Here's Why They Changed Color
Morning Start: Stop signs used to be yellow – Revelstoke Review
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What to Know About a Stop Sign Ticket in CA - Cheap Traffic Attorneys
Stop Sign: What Does It Mean?
Red means stop, except for bikers in Kansas | Grist
Why Are Stop Signs Red? And Other Questions You've Wondered About Colors on the Road - The News Wheel
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