Statewide Standard files: TxDOT Divisions maintain Statewide electronic master files. The responsible Division is identified in the plan title block, and good quality printed versions of the file may be used statewide in plan sets without being signed and sealed by a licensed engineer.

District Standard files: TxDOT Districts maintain District electronic master files, which are modified from Statewide Standard files for that district or developed by that district. The responsible district is identified in the plan title block, and good quality printed versions of the file may be used within the responsible district without being signed and sealed by a licensed engineer.

Modified Standard files: A Modified Standard file is specific to a particular job. Any modifications to a Statewide or District Standard file, however minor, must be documented briefly and dated in the revision block of the sheet, and the designation "(MOD)" must be appended to the standard plan name inside the title block. Each Modified Standard file must be signed and sealed by a licensed engineer.