They're great for low traffic neighborhoods where the intersections don't warrant something as heavy weight as stoplights or 4-way stops. I'd love to replace every ridiculous 4-way stop in my neighborhood with a roundabout, it would probably double the life of my brake pads and have no effect on safety. Except Americans are baffled by them and they'd probably get shouted down at the next city council meeting for being weird and confusing.
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They're great for low traffic neighborhoods where the intersections don't warrant something as heavy weight as stoplights or 4-way stops. I'd love to replace every ridiculous 4-way stop in my neighborhood with a roundabout, it would probably double the life of my brake pads and have no effect on safety. Except Americans are baffled by them and they'd probably get shouted down at the next city council meeting for being weird and confusing.