Worked as a Trooper out of Olean and Wellsville, many of the county roads were not marked with PA. State lines resulted in illegal extraditions, glad the statute of limitations has expired.
The rural road I live on does not have a sign on the border.
They way you know you crossed the border, is the road quality changes.
Warren Co PA takes at least minimal care of the road, while Chautauqua Co NY, not so much.
Our road LOOKS ok, but there are dips in the tarmac EVERYWHERE.
After it rains the road becomes treacherous!
There are hundreds of water filled grooves/dips that hold up to 2 inches of water. Some of these dips are 20+ yards long.
If you're not paying attention, you may Hydro plane off the road.
At very least the puddles violently grab your tire, almost ripping the steering wheel from your hand.
I don't notice as much in my Silverado 2500, but in my BMW M4 or my wifes Nissan Rouge, its kinda sporty.
When it freezes, these puddle/grooves/ dips, create hundreds of black ice areas. Luckily there is very little traffic on the road.
My theory on how the road got so bad is years of tractors and huge trucks from a large dairy farm on the road.