General Car Mode (not "driving mode") - what does it do?

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http://androidforums.com – Hey folks, I've had my S3 for about a month now and I'm really enjoying it. I just got an iBolt car dock for it, and it's raised a few questions. When I put the phone in dock it activates "Car Mode". There's a pop-up in the notifications that shows me in car mode, and says "tap here to exit". What does car mode actually do? Are there settings for car mode that I can access and change somehow? Where might I find them? Please note: I'm referring to "car mode", which only seems to activate while the phone is in the dock. This isn't the same thing a (General)