This last picture is interesting. I took it because it shows the structure of the bocage banks when they’re not overgrown and covered with undergrowth.
It looked to me very much like that lane had just been widened from a narrower path shortly before the picture was taken. If you look on the right hand side you can see a tree overhanging the lane in a most unnatural fashion, it looks like it has been undercut by some sort of digger. The bank on the left shows the same sort of undercutting, but to a lesser extent.
It looks like the undergrowth has not had time to re-establish itself and your typical bocage bank looks much more like the pictures elsewhere on this page.
And here’s a slideshow featuring some more of the bocage pictures I’ve taken on several visits to Normandy.
You can also see all these picture in an album on Google +