Blue Bridge Logo

We were asked to create a new logo for Blue Bridge, these are some of the design which i have ended up with. The final one that i am most likely to pick is either the top left or the middle right as the top left even though the letters are very close together you are still able to see that is says B B. i really like the middle left but i thyink i may need to make some changes to it as it looks a little too much like the letter D until you actually read the blue bridge section.