What do trailer seals indicate in terms of trailer security?

Trailer seals play a crucial role in securing the contents of a trailer during transport. They are designed to indicate whether the trailer doors have been opened or tampered with after being sealed. When the seal is intact, it assures that the trailer has not been accessed, providing a level of security against theft and unauthorized entry. The presence of a broken or missing seal can signal that the integrity of the trailer has been compromised, potentially leading to concerns about theft or loss of cargo.

The other options do not accurately represent the primary function of trailer seals. For instance, the seal does not provide information about the trailer's capacity or whether it is scheduled for delivery, nor does it track the frequency of door openings over time. Its main purpose revolves around ensuring the security of the trailer's contents by confirming that doors remain closed and sealed until they reach their destination.