The four most common vehicle colours in the US are white, black, grey and silver. I believe this covers like 80%+ of vehicles. Canada is worse still (so much so that many makers basically just offer the shades of grey, sometimes with a special-order red or something for the rebels), and a few days ago I was on a walk and saw a light turn red and a
dozen cars that pulled up to stop and every single one was white.
People have other colour choices, but they're constantly choosing the most spectacularly boring, neutral colours possible.
The colour thing is neat, but I'm not sure it's going to be a big deal. It might actually lead to the paradox of choice where people basically feel even worse about their options.