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Apr 21, 2022, 2:00 pm162 ptsTrending
Ars Technica
Enlarge (credit: Getty Images | Aurich Lawson) Electronic signs are a common sight on US highways. These dot-matrix displays date back to at least the 1950s and were first used to alert drivers to changing speed limits or hazards ahead, but now you'll often see messages exhorting us to drive safely. But…
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