I realized that for along while when arriving at new construction sites, mostly residential, I see the same 3 capitalized letters spray painted on the road directly in front of the work zone. What do the letters "U S A" pertain to in regards to the construction industry?
Marks the location for having utility lines possibly crossing the construction area found and marked with painted lines. This is required anytime excavation takes place in an area the utilities might be. One of the common companies that does this, or at least a phone hotline to these people is called USA digs.