Traffic light
A traffic light was a sign within the traffic from which drivers could see if they can drive or have to stop. Normally it had the colors green, orange, and red.

In the alternate reality, when  was chasing  through the traffic, they passed streets with a futuristic version of traffic lights. ()

When Captain Picard was watching outside of Dixon Hill's office window in 2364, he saw automobiles and two traffic lights. ()

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Communications technology
Security technology
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