I think at this point, "Chestnut Street" transforms into "Sweetwood Drive".

There is no "Sweetwood Drive" signs until further S down the road, but many of the houses:

- S on the left/right
- Even slightly N along the left

all have "Sweetwood Drive" addresses.

The nearest thing I can see is along the road—right to the north of 6050's driveway—there is a "Lower Macungie Township" sign... so it's probably some sort of township boundary.