What is a common carrier?

A common carrier is a transportation company that holds itself out to the public: it will carry freight for any customer willing to accept its terms, rather than working under exclusive arrangement with one company. The term comes from a long legal tradition, but its practical meaning for a shipper is simple — a common carrier takes custody of your goods for hire, and with that custody comes defined responsibility for what happens to them between pickup and delivery.

The definition, in plain terms

“Common” doesn’t mean ordinary — it means available to all comers. A common carrier publishes or quotes its services generally, accepts freight from the businesses that book it, and carries it under the terms of the contract of carriage. Historically, the designation grew out of the idea that a business offering transport to the public takes on duties toward the public: to carry what it agrees to carry, to care for it in transit, and to deliver it to the right party.

In modern Canadian freight, the everyday marker is straightforward. If a carrier will quote your shipment without you being its only client — the way any commercial courier or trucking company quotes work for many customers — it’s operating as a common carrier.

Common, contract and private carriage compared

The designation makes most sense next to its alternatives:

Type	Who it hauls for	Typical example
Common carrier	Any customer, for hire	A courier or freight company serving many business accounts
Contract carrier	Specific shippers under ongoing agreements	A trucking firm dedicated to one manufacturer’s distribution
Private carrier	Itself — its own goods in its own vehicles	A retailer’s own fleet restocking its own stores

The lines blur in practice — many for-hire carriers run both general work and dedicated contracts — but the category tells you the basic relationship: for-hire versus in-house, open to the market versus committed to one shipper. Whatever the category, commercial operators in Ontario run under the province’s operating and safety regime; the MTO is the authority to consult for what’s currently required of commercial vehicles.

What the designation means for liability and paperwork

For hire and in custody is the combination that creates accountability. When a common carrier accepts freight, the bill of lading does three jobs at once: it’s the receipt proving the carrier took the goods, the contract setting the terms of carriage, and the document that establishes who’s responsible for the freight while it moves. Ontario’s rules attach standard conditions to for-hire carriage, which is a large part of why the BOL matters more than shippers sometimes assume — our Ontario bill of lading guide covers what’s on it and why.

If freight arrives damaged or short, the carrier’s custody is what a freight claim is built on: the goods were documented into the carrier’s hands, and the delivery record shows what came out. Claims run on that paper trail, which is why noting problems on the proof of delivery matters so much — the full sequence is in our guide to the freight claims process in Ontario.

Why common carriage matters for regulated freight like cannabis

The common-carrier concept does real work in regulated industries. Cannabis is the clearest Ontario example: cannabis is federally legal under the Cannabis Act, production is licensed by Health Canada, Ontario retail is licensed by the AGCO, and the Ontario Cannabis Store is the province’s exclusive wholesaler of recreational cannabis to authorized retailers.

Carriers don’t hold cannabis licences — there’s no such thing as a “licensed cannabis carrier” in the way there are licensed producers. Instead, under the federal framework, common carriers may transport cannabis on behalf of licence holders in the course of business. The licence belongs to the shipper and receiver; the carrier operates under strict contractual, security and documentation expectations — chain of custody, sealed shipments, direct routing, incident reporting. The same pattern appears elsewhere in regulated freight: the regulatory permission sits with the businesses at either end, and the carrier’s job is to move the goods within the rules those businesses are bound by.

If you’re a licence holder planning shipments, verify current requirements directly with Health Canada, the AGCO and the OCS — the rules are theirs, and they change.

What to look for in a common carrier

Since any for-hire carrier is technically a common carrier, the useful questions are about how a specific one operates: Does it take documentation seriously — proper BOLs in, signed PODs out? Does it run your freight direct or hand it through terminals? Is there a person accountable for your account, or a queue? For regulated or sensitive freight, does it understand chain-of-custody expectations and put them in writing?

Sonic Transport is a Mississauga-based B2B carrier serving the GTA, Golden Horseshoe and Southern Ontario, running documented, same-day direct freight with a POD closing out every shipment — and for regulated loads, we’re used to working within the shipper’s compliance requirements. If that’s the kind of carriage your freight needs, tell us about your shipment and a real person will walk through the requirements with you.