we went to Spain in mid December 2009, and soon as we got of the ferry at Dunkerque at 1am we were in a snow blizzard , we just kept to the main motorway and it did start to clear as we approached Paris so just after Paris we stopped in the services for a sleep , when we woke later ,it was a white out , but i could see the traffic still moving on the road , so i put the car into 4 wheel drive and made our way onto the road there was one lane clear , but that didnt stop lorries thundering past in the unclear sections , as we got further along we slowed down to 10 mph for a few hours , there were lorries jacknifed on the other side of the motorway , then we came to the cause of us slowing down a lorry had jacknifed into another lorry ,a transit van had spun around and was facing us but not in our lane ,2 cars were in a ditch , after that we started moving a lot better a lot the of aires were blocked by lorries that couldnt get in beacause of the snow and they couldnt reverse out because there wheels were spinning , we stopped at another service area for the night which said caravans only , but luckily i parked alongside a kerb , i woke later and looked out the window and couldnt see anything , so i opened the door ,it would only open 9 inches , there was a lorry parked 9 inches from our caravan wall , we were trapped , i had a small step ladder under the bed so i lowered the ladder out of the window and climbed out then i had to clean the car off it was looking like an igloo , so pulled forward and let my wife out and continued our journey , now we had a new problem the wiper blades were freezing even with screen blower full on , so we had to stop at every service station and bash the blades against the screen , i was still living in hope that it would when we got to Millau bridge , but it was just as bad , my next fear was the steep hills and twisty bends by the pyrinees , but luckily shortly after the bridge the snow had dissappeared , but it was still minus 8 approaching Barcelona , it was the most horrendouse car journey i have experienced in 45 years of driving , other people who tried to leave the motorway to seek sanctuary in sites got stuck , because the roads after the motorway were not clear , some were held up for a week , but that winter was an exception we have been at the same time before and sailed through , but the french do keep the traffic moving , not like here where it comes to stanstill