I don't think that's interpreted as go faster that the speed limit if others are. I believe it's moreso not to drive aggressively. If the person in front of you is driving 40mph, you shouldn't be going 45mph even if the speed limit is 45mph or higher. I'm not a Californian though so it's possible your interpretation is correct for that jurisdiction. Thanks for citing what you were interpreting as allowing one to drive faster than the speed limit though.