In many states that I've traveled,some have a minimum speed limit,as well as a max speed limit for the interstates.
Yes, a driver can be ticketed for driving too slow ie; impeding traffic flow.Just as well as driving over the posted speed limit.
For example,some years ago,I was heading north on Hwy 99,Modesto,California.Just got on the highway.
Now, this area is 65 MPH.I was in the right hand lane.
The driver was doing 35 MPH ! Yes, that driver should have been pulled over.For what the reason was,I'll never know.(saving gas ??)
The most recent was a few weeks ago.Heading south on Hwy 99 to Modesto.I was near Manteca,when a driver pulled out in front of me doing 45 MPH.Not speeding up.When clear,I passed him/her doing 55 to 60 MPH.
The driver made no effort to speed up to at least 55 MPH.(again-saving gas ?)
Now granted,IF they were having mechanical problems,they should have driven off to the side,as to prevent an impedment of traffic.
But, yes, there are overly cauticious(sp) drivers.
The ones I really don't like,are the ones that are in a hurry,just to be in a hurry.They zip from one lane to the next.These are the ones that are a danger not only to themselves,but everyone that are around them.
And then,there's the idiots;3 lane highway.They'll be in the fast lane,see the off ramp,then zoom across
the other 2 lanes,just making to the off ramp.No signal,not really looking to see where other vehicles are.