What does 'Shortening of In-Transit time' means?

What does 'Shortening of In-Transit time' means?

The in-transit time will only be shortened when required by another agency's transit requirements. The primary reason why CBP would shorten the in-transit time would be to comply with U.S. Department of Agriculture (USDA) statutory requirements related to
merchandise moving on a USDA permit. Other government agencies may also require shortened transit periods. CBP will provide notice to the carrier to facilitate compliance. CBP will communicate to the carrier via EDI when the in-transit time has been shortened. CBP agrees that
the creation of a disposition code is a good idea and will endeavor to create a new disposition code for this purpose.