There's a very boring, practical thing that most of those colors have in common. White, silver, and gray make your typical road dirt less visible. Black also accomplishes this pretty well in climates where they don't need to salt the roads.

Blue and red are common favorite colors, so it's not surprising you get a little of those. Brown and tan used to be very common up until the late 80's or so; I'm not sure why that went away but that's the only one that seems surprisingly absent.