TIR in transportation stands for Transports Internationaux Routiers, a French term that loosely translates to “International Road Transport,” and it refers to a global customs transit system designed to make cross-border trucking faster, simpler, and a lot less bureaucratic. When you see a truck with a blue TIR plate on the back, it means that the cargo is moving under an international guarantee system that allows it to pass through multiple countries without unloading or undergoing full customs inspections at every border, which is honestly a small miracle if you’ve ever watched a line of trucks crawl across a frontier.