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How tall are traffic lights?

My friend and I are having a debate. She says that the height of traffic lights differs from state to state, but I’m pretty sure they have to be the same height everywhere in the U.S. Can you help us set the record straight on how tall traffic lights are?

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Mary Cahill · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Sounds like an interesting debate you’ve got going! While there’s no concrete law about how tall traffic lights are or have to be, they’re generally positioned 18 feet off the ground.
The traffic lights themselves are a lot bigger than you might expect—typically measuring about four feet tall! The lights within them are usually 12 inches, but an 8-inch light is used on roads with very little traffic.
Traffic lights must be noticeable so that drivers see them easily and obey their signals—but if an accident at a light caused your premium to skyrocket, finding an affordable
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