Keep in mind contracts are a legally bonding document. There is the intent and there is the letter of the contract. This can often be up to interpretation.
The contracts can be seen as a form of protection, leaning in the favor of who wrote it. The transportation liability in a contract will always favor one side over the other.
Basically, a contract covers what is expected (by all involved). It will include the services that are being offered. A contract should cover payment, time tables, and even individual responsibilities. The part that gets most people is what it says about when it isn’t honored. At least not to the satisfaction of both parties involved!
Think about it, you never hear about contract disputes because everyone is happy. You only hear about it when one side or the other isn’t happy.