Understanding the roles of carriers, brokers, and 3PLs is essential for shippers building a freight procurement strategy.
A freight carrier is an entity that physically moves freight. Asset carriers own the tractors and trailers. They hire drivers, maintain equipment, and operate under an FMCSA-issued motor carrier authority. Hiring an asset carrier directly means working with the company that will actually transport your freight. This can provide more operational control and accountability, but asset carriers have limited geographic reach and capacity compared to broker networks.
A freight broker acts as an intermediary. They match shippers with carriers, earn a margin on the transaction, and bear the brokerage liability for ensuring the carrier they arranged is licensed and insured. Brokers do not own equipment. Their value is network breadth — a large broker has relationships with tens of thousands of carriers and can find coverage almost anywhere. The tradeoff is that a shipper hiring through a broker has less direct control over which carrier handles their freight.
Double brokering — when a broker re-brokers a load to another broker, who then finds the carrier — is a significant and growing problem in the industry. It dilutes accountability, hides the true carrier from the shipper, and creates scenarios where the actual carrier has no relationship with the entity responsible for the load. Shippers can reduce double brokering risk by requiring carriers to confirm their own authority number before dispatch and by monitoring FMCSA records.
A third-party logistics provider (3PL) typically offers a broader service scope than a broker: transportation management, carrier contracting, freight audit and payment, warehousing, and supply chain technology. A 3PL may use both asset carrier relationships and a brokerage arm to cover their clients' freight. The Dock Optimizer platform, which powers the load posting workflow on this site, operates within this ecosystem.