First off, my apologies for dragging up a 4+ month old thread but...
While I see the need for going to a wider 6-inch stripe on freeways, highways and other higher speed roads, I really don't see the point of using them on city streets in urban areas. Case in point, the city of Sunnyvale recently repaved a section of Hollenbeck Avenue, a 2-lane city street through a residential area that sees a fair amount of traffic, and the city laid down 6-inch wide double-yellow lines. The lines are closer together due to the added width and look ugly as &^%$!
My question to those living in states where they use 6-inch stripes on freeways, does that carry over to city streets as well?