If I remember correctly that road is part of Swanny's Casino Run ride. You're right, it is a very nice twisty road indeed... for North Texas that is.
I remember one time we were all eating at a local hamburger shack in Sherman on a Swanny ride. It looked good with lots of local cars around it so we stopped. And it was good by the way!
As I was talking to the spousal unit outside on the cell a Sherman PD squad car slowly drove by checking out the bikes, then stopped and backed up. I'd finished my call so I approached the officer and asked him if everything was OK and if he needed something. He said he was just admiring the bikes and mentioned we didn't look local. Which I interpreted as he realized he hadn't ticketed/arrested us before.
The last thing he said before he drove off was that we really should hit 697 (he also had a local slang name for it which I have forgotten) on the way out of town and that it was a really nice bike road. Which I also interpreted as "yeah, you guys go right ahead and check it out while me and three other cops set up radar traps on all the straight aways"!!!!
He was right, it is a really nice road and actually, no he wasn't waiting for us!
But there was a crashed ZX6 Ninja parked on the oustide of a turn. I assume the rider was seeking medical attention in Sherman.