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A recently surfaced video shows that the electric car maker still has a lot of work to do before it's ready for use.
A terrifying demonstration of the software's serious flaws can be seen in a video posted by the account DetroitTesla.
While the vehicles can deal with California's perfect weather, the system is nowhere near.
The vehicle appears to race down a snowy street at dangerous speeds and struggles to stop, causing the wheels to lock out while decelerating hard.
At one point, the vehicle appears to stray off into the curb due to its cameras not differentiating between the road and sidewalk.
We're not talking about a lot of snow, but average winter conditions in Detroit.
The driver says in the video that he doesn't think the neural nets have been trained for snow.
"I can't even get my sentences out without the car going nuts," he said, arguing that he had a similar experience a year before.
Despite its marketing, it still has a long way to go before its cars can drive themselves in average weather.
There are dangers to using the feature on public roads without paying attention.
The video shows that full self- driving can't handle snow.
There was a case of full self- driving on school buses.