When it comes to safety, there are more vital traffic laws out there--like alcohol blood content, red lights and stop signs. In my experience, the speed limit is set at the lowest common denominator--the speed at which the most incompetend driver could drive safely. Supposedly, the speed limit is what you should drive in
ideal conditions, but it's more like what you should drive when it's nighttime, with heavy rain. That's how I choose to understand it, anyway.
I like how in Montana, drivers can obey the intent of the law, and drive at a "reasonable" speed. I wish we had laws like that around here. Or at least, I would like to be able to take another driving test and qualify for a "may drive faster" driver's license.