|| <--Crossroad
                         /||\          <--(one way)   Frontage Road
-------------------------------------------------------------------
         /            \   ||   /          \
        /              |  ||  |            \ <--Interchange ramps
       /              ----------            \        'I-Route'
-------------------------------------------------------------------
-------------------------------------------------------------------
       \              ----------            /        (Freeway)
        \        ,---> |  ||  | <---.      /
         \       |    /   ||   \    |     /       
-------------------------------------------------------------------
                 |       \||/       |  Frontage road   (one way)-->
       'Texas U-Turns'    ||        |
                 |                  |
                 `------------------'