Being a michigander myself, I have to go through these things every day. For those of you who have never been to Michigan before, I'll try to do some ASCII art:

   |  |    |  |
¯¯¯¯  ¯¯¯¯¯¯  ¯¯¯¯¯
____  ______  _____
   |  |    |  |
   |  |    |  |             ^
   |  |    |  |             |
   |  \    |  |             N
   |   |   |  |
   |   |   |  |
   |   |   |  |
   |   `·-'   |
   |          |
   |  |`·-'|  |
   |  |    |  |
   |  |    |  |

Near the top is an intersection of a street and a 2 lane highway. Shortly after the intersection, the southbound lane of the highway widens. This lane eventually becomes a left turn, leading to the northbound lane.

In reality, there would be another one of these that would allow people to go from the northbound lane to the southbound lane, but I'm too lazy to "draw" it.

Anyway, if you were going east and wanted to go north, you would turn south at the intersection, then get in the turn lane and follow the turn into the northbound lane.