Signs with orange backgrounds are:

Signs with an orange background are warning signs used to alert drivers of work zones ahead - such as construction, maintenance, or emergency operations - and warn that people may be working on or near the roadway. These signs are typically diamond- or rectangular-shaped with black letters or symbols. Common examples include signs for workers ahead, reduced speed limits, detours, slow-moving construction equipment, and uneven or changing road surfaces. When you see these signs, slow down, proceed with caution, and be prepared to stop if necessary.

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