Truck driver here...
I have researched the laws, and what I found was, driving Bude is completely legal in the US. I am a truck driver and I often drive with nothing on except a t-shirt or tank top.. I don't think even other truck drivers can see that low into my cab, I wouldn't care anyway. When in my car at home, I drive nude alot, truck drivers can definitely see right down into cars. I have seen my share of panties, and a few nude drivers as well.. I always keep a pair of loose fitting shorts in reach just in case..
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