[ghaff]

You'll only get ticketed unless you're going really slow for no good reason. But in general if you're poking along even in the right lane at 10mph under the speed limit and below the flow of traffic you're basically causing a whole lot of lane changes as everyone tries to flow around you.

One of the reasons I hardly ever use conventional cruise control is it makes you drive in a way that minimizes speed changes rather than doing what makes sense in the context of other traffic.