Computer vision and railway semaphore: what they have in common

1. Step 1. Computer vision — is used in — Self-driving car. Recognizing the road.
2. Step 2. Self-driving car — has part — Lidar. Lidar builds a 3D map of the surroundings.
3. Step 3. Lidar — is made of — Gallium arsenide. The laser diodes are gallium arsenide.
4. Step 4. Gallium arsenide — is material for — LED. The first LEDs were gallium arsenide phosphide.
5. Step 5. LED — is part of — Traffic light. LEDs.
6. Step 6. Traffic light — evolved from — Railway semaphore. The first traffic light was a railway-style semaphore.

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