Executing the contract requires TxDOT's signature authority and the performing entity's designated representative to sign the contract in the signature block. The signatures signify mutual acceptance of the agreement and must be followed by a typed or printed name, title, and date of signature. A contract is fully executed when all parties to the contract have signed and dated the signature block. TxDOT contracts contain a provision that states that, the performing entity cannot begin work or incur costs until notified in writing by TxDOT, or until it accepts and signs a work authorization issued by TxDOT. Should a contract contain different language, the performing entity must follow the procedure set out in that contract.