A Critical Rule for Drivers: Just because a sign lacks city backing does not give you permission to ignore it. If you breeze past a blue sign in a private parking lot and collide with another vehicle, insurance adjusters and civil courts will almost certainly find you at fault for failing to exercise ordinary care.
From a safety standpoint, the prudent move is simple: always treat a blue stop sign exactly like a standard red one. It was placed at that intersection because someone recognized a blind curve, a busy crosswalk, or a dangerous blind spot.
Why Standard Stop Signs Are Red (A Short History)
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Seeing an unusual blue sign often makes people
appreciate how consistent our regular road system really is. That uniformity took decades to build.
When the first stop signs appeared in Detroit around 1915, they were small, square, and black-and-white. In the 1920s, traffic engineers switched the background to bright yellow with black letters. Yellow was chosen simply because early paint manufacturers could not make a weather-resistant red paint that stayed bright and reflective under car headlights at night.
