Some people say Basingstoke is good for roundabouts but Hemel Hempstead has the one and only Magic Roundabout. This is a large roundabout which has a series of small roundabouts at every entrance and exit. The scariest effect of this is that the mega-roundabout is actually a two-way road.

e.g.


                     \\  | |  //
                      X===X===X
                     //       \\
                  ===X         X===
                     \\       //
                      X===X===X
                     //  | |  \\
I guess that looks rather like a carbon ring but I'm afraid drawing the 7th roundabout was beyond my skill.