RW> Look at the diagram below. The roads to the dam on the Nevada side and
 RW> the roads leading away from the dam on the Arizona side are winding
 RW> all
 RW> around, BUT, when you cross the dam (which is slightly curved), you
 RW> will change from one state to the other in the middle of the dam.

 RW>  ML>>     ________________________________
 RW>  ML>>    |                |               |
 RW>  ML>>    |     State A    |     State B   |
 RW>  ML>>  W |                 \              | E
 RW>  ML>>  E |           ,-4--. \             | A
 RW>  ML>>  S |          /     1  2            | S
 RW>  ML>>  T |         /  ,-3-'  |            | T
 RW>  ML>>    |         \  \______/            |
 RW>  ML>>    |          \                     |
 RW>  ML>>    |          |                     |
 RW>  ML>>    |__________|_____________________|



  Okay.

--- PPoint 3.01