>>42 in a fog? What are you, some kind of mad man? <g>
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>That's 26 mph, AFAIK - but I once did drive about 50-60 kmh in a dense fog, on sheer madness, or not. The visibility was so low that I could see only the length of one cut line, or the break between them. So whenever I drove any slower I'd lose the direction - the edge of the road was just gray on gray, the only contrasting thing were these dashes in the middle. At 40 mph I could keep it straight.
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>The mitigating factor was that the road was practically empty. I drove about 50 km of such road, and met a total of two vehicles in my direction, both trucks, which luckily create a whirl behind them so they were visible on time.

I had to drive home from school once in a very dense fog from a recent snow fall. On the freeway, no big problem even at 50 mph as that's what traffic was doing and it was blowing the fog around, visibility was really not that bad. However, once you got off onto the side roads, that was an entirely different matter. I couldn't even see the hood ornament on my car! ('77 Monte Carlo, the hood seemed like it was a mile long <g>) Kind of had to drive by "feel" the rest of the way, when you heard the tires crunching gravel and/or snow, you turned back onto the road a bit. 15 mph was really dangerous in those conditions.