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Just to echo everyone else, it's not self steering. You turn it on, and YOU continue to steer. It keeps people from drifting out of their lane, that's it. This is why it won't actually hold a turn on its own at freeway speed, it isn't designed to fully take over steering.
Tesla's isn't either, but it's a bit more capable and people try to use it this way. They have their own idiosyncrasies to deal with though. Truth be told I've used the BMW system that way (or rather abused it), by keeping a hand on the wheel but making it do most of the actual steering. It's called "lane keeping assistant".
It's meant to avoid those small accidents where people get distracted and go over the line or something. It's pretty common for people to look away for a moment, realize they're going out of their lane, over correct, and cause an accident.
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