I'm in Bradford. The west side, close to the moors.
I recognised that road and reservoir straight away! (Cold Edge Road and Warley Moor Reservoir.) It is a while since I have been up there but I must have done it at least a dozen times over the years.
The first few times I went that way it was an unmade road higher up but eventually the council did resurface it. I'm not sure what it is like now?
I see above that you had a couple of crashes on ice... I'm not sure if it was on that road, but that doesn't get gritted and the road further on from that barely sees the sun in winter so it can be lethal!
I went up there for a ride one winter and discovered a river of black ice covering the road for about 100 metres. I dismounted and walked my bike up the grassy verge until I got beyond the ice and had just started riding again when I spotted a motorcyclist flying down the hill towards me so I stood in the middle of the road and flagged him down. I told him of the dangers beyond - he thanked me and turned round. It would be a terrible place to have a bad crash in winter; it is quite possible that nobody else would come along there that day and you would probably die of exposure overnight if you were not able to phone for help.
It is horribly wet today but I quite fancy riding up there again soon. Maybe in the next week or so...