As described in , a SLOA is required for a local government (LG) let construction project prior to initiating the Letting phase. The SLOA from TxDOT to the LG functions as the Notice to Proceed with the Letting phase and must be signed and dated prior to advertisement of the project. For projects where the LG is performing construction by force account, the SLOA must be signed and dated prior to commencement of construction by the LG’s forces. Federal-aid projects require a federal project authorization and agreement (FPAA) in addition to the SLOA.