If you are getting frustrated by what the vehicle in front is doing then you should back off.
Which is exactly what I did. You'd be surprised how quickly you gain on another vehicle when they practically stop on a bend. I left approximately five seconds worth of stopping distance between me and the car in front.
The van behind me was so close I couldn't see his from headlights in my rear view mirror.
However when you're driving in these conditions continual changes in speed and direction are very difficult to read for cars following.
That is quite right in good conditions, Pongo. The trouble is that on ice and snow, if you don't maintain your momentum you can very quickly lose adhesion which puts you and everyone else on the road in a tricky position.
To go back to the other morning on the Creg back road, I was ascending the incline by the plantation making steady progress on ice and snow in third at about 25mph. Some vehicles towards the top a couple of hundred yards in front of me were crawling along literally at walking pace and some were actually stopping. What the hell are they doing? So then, of course you slow down to about 15mph because you don't want to reach them and have to stop so that everyone is stuck. In that scenario there isn't a lot of choice but to get pretty close to them if you want to try to keep going. As we approached the summit some had got themselves stuck and spinning. Luckily, it was just at the point where you start to get visibility of the road ahead so a few of us were able to pull out and round, keep our momentum and pass them. Then of course they look at you as you pass as if it's you that is stupid, but they're the ones that have got themselves stranded.
I once got myself and my wife stuck (I was driving), at night, in the middle of winter in the middle of Algonquin National Park in Ontario in a FWD Ford Taurus rental car.
I was surprised to see a couple of cars driving what felt to me like straight at me (in the opposite lane) at quite some speed. I was driving slowly at maybe 15-20mph before I ended up getting stuck going up a hill.
Fortunately we were lucky and found help to get us dug out of the mess we were in.
The tip from the locals was - don't slow down, avoid changes in speed and direction and try to drive quickly - very fast over the hills to keep momentum up. The drive out of the park to the main road felt like a rally by comparison. No serious skids, we didn't get stuck and best of all no crashes.
Whilst keeping plenty of distance between vehicles is important; It is possible to drive too slowly and "twitchy" in snowy and icy conditions.