I would not likely have ridden out in the dark in a fog this thick - and it was quite thick in areas! - except that I know these roads like the back of my hand. Still, I missed one turn and had to double back.
Fog thick enough to require rain gear - and needed my battery heated gloves for the 42°F temperature.
BTW - other than providing a lot of nighttime glare-back, my Piaggio flyscreen does
zip to keep me dry or warm
but it's low enough to not bother my vision of the road when soaked.
parking brake on.....
brakes off....
oem 55/60W Halogen headlight gives me a nice flat cone of light.
It was a very wet ride - and required 10>15 sec. wipes to clear the visor.
Stig