Coastal fog signals sounded through the night to warn small fishing boats of the low visibility.

Please use your turn signals when changing lanes on the highway.

During the experiment, the equipment produced several false signals that skewed the results.

Engineers designed filters to reduce noise in analog signals before conversion.

Engineers analyzed the digital signals to improve network reliability.

The train crew monitored the block signals closely during the storm.

Neighborhood watch volunteers reported suspicious gang signals on the street corner last night.

During the storm, our calls kept returning busy signals, so we had to wait until morning.

After weeks of inconsistent texts and compliments, I couldn't tell what he meant — the mixed signals were overwhelming.

During the outage we kept getting fast busy signals whenever we tried to call customer support.