Traffic Signal Collection
Crouse-Hinds Type M 4-Way Beacon
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In the mid century, 4-way beacons were common for indicating dangerous intersections or to reinforce 4-way stops. Yellow indications facing arterial streets warned of vehicles entering that might not be clearly seen, and red indications naturally meant "stop."
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This particular beacon came with all yellow and red indications, so it was likely installed over a 2-way stop intersection, signaling approaching motorists to be cautious or to make full stops.