The problem is......
Almost every State, City, County and Community now has their own CAD standards and they usually are not the same. For instance here in Dallas we have the following authorities, all with different standard. You just have to obtain them from the entity you will work with.
Ballas Public Works
Dallas Water Utilities
Dallas County
Dallas Area Rapid Transit
Texas Dept. of Transportation
Most of the 20 or so suburbs also have their own standard.
Most work with Microstation, no Autocad.