[ehnto]

That's not accurate, so many designs of cars are hard to see the side profile of even with lights. Even if it were, it's not bourne out in studies of paint colour and crash risk. Grey/silver represents an increased crash risk, especially at night.

Something I think hinders visibility is also that cars are often amongst dozens of other lights, especially at intersections where it matters most.

[jabl]

Actually the Australian study you quoted earlier showed that the difference in crash risk was largest during daylight hours, as in Australia many people drive with their lights off during daylight.

But yes, I suspect if you were to redo that study in a country where people always have the lights on (perhaps due to local law if nothing else), you'd see the biggest difference in poor lightning conditions.