If they cannot go a min speed they should stay off of the road,, Here in the Mnts you come around a curve and bam there is one at a crawl right in the middle of your lane.
I ride a bike alot, but I stay off of the roads.
Never outdrive your line of sight. You should never go so fast that you can't react to a hazard around the bend or over the hill. It's dangerous and dumb.
