Doltish Drivers

I spend a lot of time on the road and try to stay alert by exercising my brain. One of these exercises is seeing if there is a link between doltish drivers and specific vehicles. The obvious, in Colorado, is a Subaru. A minority are going like the hammers of hell and the rest need a glass belly button to see where they are going. Less obvious, but the one that gets my vote, are drivers of Chevrolet HHR retro panel trucks.

What are your suggestions?