As you know, Tesla and many other companies are pushing the idea of self-driving. “The car will drive itself; you only need to supervise it” – this is the message. “And later, your car will be smarter and can drive without any supervision”. But they all want you to buy now, and smartness will come later. Maybe.

But is it safe? Let me start with something simple. Even simple tools like adaptive cruise control and lane keep assist can fail, and you need to be ready for this case. Ideally, you need to know when it is safe to use them.

For example, imagine you are driving 75 miles per hour in the leftmost lane. To the left of you,