Self driving cars are very cool, but they are still struggling with non-ideal conditions such as bad weather: "A fully driverless car needs to operate safely in all environments ... Road markings can wear away or disappear under snow. And modern laser-surveying sensor systems (called LIDARs, after light detection and ranging) may not be accurate in those conditions. LIDARS calculate distances by illuminating a target with laser light and measuring the time it takes for the light to bounce back to the source. Radar does much the same thing with radio waves. In cars, LIDARS and radars have an effective range of around 50 metres, but that can shrink significantly in rain or when objects are obscured by vehicles ahead. Even the smartest car travelling at motorway speeds can 'see' only around a second and a half ahead."
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