Comment by throwway120385
12 hours ago
Could you use a different spectrum of EM radiation to detect water? There are parts of the microwave band that attenuate the signal by absorption and I wonder if you could use that. The only clue a human driver has in that situation is in the visible spectrum. The lines of the road disappear from view, which can be challenging to see at night.
In theory you could send different frequencies, but then you run afoul of all kinds of potential interference with other systems and other local regulations.