jlee, is it an absolute no-no for someone to pass you when you're already doing the limit?  Is that an automatic pull-over?
		
		
	 
I'm always interested in that.
Thankfully, most times I encounter cops on the road, they are either going above or below the speed limit, not at the limit. So either I let them pass me (or get way ahead of me), or they are going 5mph under and I can pass them and slowly, ever so slowly, build up the distance between them and I, and eventually get to a distance where I can push the accelerator a little more. 
jlee - another question regarding DUIs, specifically relating to this type of arrest.
Is it possible in any way to avoid a DUI by sleeping in your car and throwing your keys someplace not by the drivers seat? Maybe pass out in the back seat or passenger seat? Or, is it as I have heard, that the keys need to be outside of the vehicle if you are going to purposefully pass out inside the vehicle after drinking?