The point I was trying to make in a previous thread was about....Big Tee (I think) who drove through unfamiliar water covering a road. Given his circumstances (the farmer who also led him), I'd have made the same choice. However, there can sometimes be circumstances that are unforeseen.
I've seen where gophers, ground hogs, badgers and other animals have dug under roadways to make dens. These holes usually get filled in over time by Mother Nature, but sometimes the conditions and timing happens to be just right and one of these rare problems will occur. ...Personally, I don't see how it's even possible for gophers, but that's what I've been told by a road engineer. Maybe due to the number of tunnels in a given area?
Anyway, as it was explained to me (and as I can remember!!), when there are open spaces OR loose soil (such as from recent digging - ie; working on a culvert), then the road may not be fully supported by the soil. When water gets in, it can cause a sudden shifting of the remaining soils which "can" lead to larger problems. The only reason I stuck my neck out there to get chopped off is that 2 different times, I have personally seen such miniature cave-ins where a vehicle got stuck in a flooded roadway and had to be rescued, and there was no other explanation; fortunately, nobody died. I've also seen a culvert where water, over a long period of time, was able to flow not only through the culvert, but also over the outside of culvert through the rock. It took a number of years, but the roadway eventually collapsed and revealed this huge chasm large enough to swallow a VW Beetle!
I know it's not likely for such things to happen, but they inevitably "do" happen. I'm not sure how such things work with bridges, but there must be some logical safety concerns that get checked out, just in case.
I've driven through flooded roadways, and will likely do so again. For me (and in this area), it's worth the slight risk, and we don't normally make a habit of driving through flooded areas anyhow. In other areas, there may be other problems. I've heard of sink holes appearing all over the southern half of the East Coast, to include Tennessee. Seems if it was too big a sink hole that you'd see a tell-tale pattern in the water.....but maybe not. I don't know.
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