Sigman Road / Abbott Lake Road

Changing road ID #2472006600 functional class from 5 (Major Collector) to 6 (Minor Collector).
### Description
Issue identified by ARC to redefine functional classification to not end at an arbitrary point.
### Justification
Issue identified by ARC to redefine functional classification to not end at an arbitrary point.
#### From
Iris Drive
#### To
Rockdale / DeKalb County line
#### County
Rockdale County