Having seen the forecast I put the snow tyres on early last week - not driven on snow tyres before so yesterday I went out to find out how good they are and where there limitations are.
Our little bit of road is private - so it doesn't get any work done on it

so theres a worn out bit and a dip just as it meets the main road - and in the snow that gets compacted, freezes, and stops people getting any traction there on the slight slope. Even in the BX on Michelins I needed a push on one occasion there - before I made the decision to clear any snow from that area as soon as it fell.
I left that area snowy this year - a neighbour had problems getting out - an ex police driver he always takes the car out whatever the weather so that spot was definitely iced up - the BX with its snow tyres just went straight across without any wheelspin
I took to a single track country road with a hill looking for the skiddy stuff and found some sheet ice - wiggling the steering showed there was the possibility of sliding but generally it was very good. However in front of me was a Citroen white van - and in front of him on the hill was a horse and rider taking things very slowly and the van had to stop and couldn't get going again - so I had to stop as well. Initially I had wheelspin but leaving the wheels spinning at very low revs they finally found grip and got going but the van was not so lucky. Trying to help the van driver by chipping the ice around the driving wheels I broke my plastic snow shovel

but then it's not designed for that so
mea culpa. I figured it would be a good idea to keep a garden hoe in the car for chipping away at compacted ice. Eventually the van had to reverse back down to level road and take another route leaving the BX to take the hill without any problems.
I wanted to check the fuel consumption having filled to the brim last week (and spilt some on the forecourt) with the new fangled Shell diesel - the mileage on fillup was exactly 207,000 so that was easy to remember - the red light had been on for a few miles and it took 10.5 gallons so I figure I have the 11 gallon tank. Driving in the snow was going to screw up fuel consumption + leaving the car running for 10 minutes before driving (with the car
locked using the spare key of course) wasn't going to help either - I still had some 8 gallons left but I wanted to keep the tank full - there's the extra weight and if you really get stuck you've always got warmth from the excellent BX heater. At the pump I found the lock barrel on the filler cap had frozen and I didn't have any de-icer with me.
Finding some other country roads the snow tyres performed very well - at one point there was an oncoming truck and not enough room so I reversed onto a rough grass verge covered in about 7 inches of snow to let him pass - driving off again without any loss of grip
So the conclusions... though they do have their limits they are excellent on fresh snow and loosely covered compacted snow. They will let go on ice (no real surprise there) but will eventually grip. It's very easy to become complacent on ice because directional control is still very good which can give a false impression of how much stopping power there is at icy junctions but they resond very well indeed to pumping the brakes to get traction - nearly embarrased myself at one junction but pumping saved the day
