Learn about AB 5 and how to determine if a worker is an independent contractor or employee. How do I fill this out?A transportation service agreement is a legal document that defines the rights and duties of both parties to the contract. 1 During the performance of this License, Licensee agrees to comply with the. A transportation service agreement is a legal document that defines the rights and duties of both parties to the contract. The terms should then be laid out in a contractor agreement that both parties should sign. A transport services agreement (TSA) is an arrangement between two parties to provide transportation-related services.