On a damp road in half light (moornings or evenings) it can be near
invisible. As my missus found out in her corsa after an idiot jumped a
red claiming she wasn't there when he crossed the line, but he only hit
her rear quarter. Silver Corsa, just daylight, streetlights still on,
damp road.

Depends on the shade of grey. If it's a dark silver then yes it can be near
invisible.

I was doing a right turn ( UK ) once at a crossroads and didn't notice the dark
metallic grey Ford Granada coming the other way until I had entered the
junction. I stopped but the other guy was going rather fast and didn't seem to
be interested in avoiding me ( although there was room to pass without even
stopping ). Embarassing.

I wouldn't want to buy a car that colour myself even though I do think that
Platana is a rather nice colour.

Graham

Owned a silver Corolla GTS for many years.  I averaged getting run off the
road about 2 times a year, from people who obviously didn't see me.  I live
a bit east of Cleveland, Ohio USA, a couple miles off lake Erie.  Weather in
these parts familiar to those in Seattle or Glasgow.  (Ok probably a bit
cooler in the winter.)  With a grey sky and a bit of haze that little silver
car would disappear to many other drivers.  Driving with the lights on all
the time helped some.  Finally had to get rid of that car, couldn't trust
the kids to drive the thing.  Car was a nice ride, but someone was going to
clobber that thing sooner or later.  I'd rather it wasn't someone I was
closely related to.

dave

saw some stats a few years ago about accidents related to car colours

bright yellow was "best", and light blues / greens that fade into
backgrounds in poor light were worst.

ironically most demo cars in the UK seem to be silver - because the dealers
find that colour sells easiest (anecdote from a dealer, but he was selling
me a silver 9-5 at the time).