Traditional automakers like Mercedes and Toyota already make vehicles equipped with systems that keep cars within their lanes, apply the brakes or park by themselves. Their plan is to gradually automate more functions of driving until, perhaps by 2025, some cars will be fully capable of driving themselves.
But Google, Alibaba, Baidu and other tech companies are aggressively working on their own self-driving vehicles, and could leapfrog the car industry in bringing them to market. Google, for instance, promises to deliver a self-driving car in five years.
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