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How does a self-driving car work?
Quick answer
A self-driving car works by using sensors to see its surroundings, software to decide what to do, and motors to steer, accelerate, and brake. Cameras, radar, and laser scanners build a live 3D map, and AI uses it to drive without a human.
Step by step
- Sensors (cameras, radar, lidar) constantly scan the surroundings.
- Software fuses them into a real-time 3D model of the road.
- AI identifies cars, people, signs, and lane markings.
- It predicts what others will do and plans a safe path.
- Controls then steer, accelerate, and brake automatically.
People also ask
How does a self-driving car 'see'?
It combines cameras, radar, and often laser scanners (lidar) into a 3D picture of everything around it, updated many times per second.
How does it make driving decisions?
AI trained on huge amounts of driving data recognizes objects, predicts their movement, and plans safe steering, speed, and braking.
Are self-driving cars fully autonomous yet?
Most still need human oversight; truly driverless cars operate only in limited areas and conditions while the technology matures.
Are self-driving cars safe?
They aim to reduce human error, but the technology is still maturing and faces tricky edge cases.
What are the levels of self-driving?
From 0 (none) to 5 (fully autonomous anywhere); most cars today offer partial assistance.
Part of the guide: How AI Works →