Trucking to Mexico Through Otay Mesa

How trucking to Mexico works from Southern California

Trucking to Mexico from Southern California usually runs as three legs: a U.S. truck brings the freight to the San Diego border area, a transfer carrier hauls the trailer across the border, and a Mexican carrier delivers it inland. Our freight crosses mainly at Otay Mesa, California's busiest commercial truck crossing.

We run the first part. We pick up at the port or your facility, transload or consolidate in Long Beach when needed, and move the load south to the handoff with authorized partner carriers for the crossing and the Mexican leg. Your Mexican customs broker files the pedimento, your U.S. side handles any export filing, and we coordinate timing and data with both so the truck does not reach the border before the paperwork does.

This page covers the Mexico-specific details of shipping to Mexico by truck. For the overall model and a side-by-side with Canada, see our cross border trucking overview.

Why trucking to Mexico uses transfer carriers

A transfer carrier, also called a border drayage carrier, is a short-haul trucking company that shuttles loaded trailers across the border between yards on each side. It exists because carriers from each country generally may operate only within a narrow zone on the other side of the line.

Mexican law reserves domestic trucking permits for Mexican nationals and Mexican companies (Article 9 of the Ley de Caminos, Puentes y Autotransporte Federal), so a U.S. carrier cannot pick up and deliver freight between points inside Mexico. The United States restricts Mexican carriers and drivers in the same way: they may carry international freight, but CBP's guidance is that a foreign driver may only take goods loaded in the United States to Mexico, not haul domestic U.S. loads. FMCSA counted 5,232 Mexican carriers active in the southern border commercial zones in May 2026, and cabotage enforcement there tightened during 2026.

The practical result is a relay. The trailer may stay the same while tractors change, or the freight may be transloaded into a Mexican trailer at a border warehouse. Either way, three carriers and two customs brokers usually touch a single southbound shipment.

Through-trailer or transload at the border?

There are two ways to move freight across the Mexico border by truck, and the choice affects cost, capacity and handling.

Documents for trucking to Mexico

Southbound freight is documented on both sides of the border. The pedimento and the Carta Porte are the two Mexican documents most often missing when a truck is held.

The pedimento and the Mexican customs broker

The pedimento is Mexico's customs entry document, and only a licensed Mexican customs broker (agente aduanal) can file it. Article 36 of Mexico's Ley Aduanera requires that a pedimento with information about the goods be transmitted electronically to customs, and until it is filed and cleared a commercial import has not legally happened.

The agente aduanal classifies the goods, calculates and pays duties and taxes to SAT, checks product permits and standards, and represents the importer if the shipment is inspected. Large manufacturers sometimes use an apoderado aduanal, an in-house customs representative employed by one company, instead of an independent broker.

The importer of record in Mexico appoints the broker, so the Mexican consignee is normally the party that chooses one. Confirm the broker works at the crossing your freight will use, because a broker without an office or working arrangement at Otay Mesa cannot clear your load there. Send the commercial invoice and packing list to that broker before the truck leaves Southern California.

Carta Porte: the document for freight on Mexican roads

The Carta Porte is a CFDI, Mexico's electronic invoice, with the Carta Porte complement attached; it travels with goods moving on Mexican federal roads. SAT's version 3.1 has been the only valid version since July 2024.

A carrier charging for freight issues it as an income-type CFDI; a company moving its own goods in its own trucks issues a transfer-type CFDI with zero value. It lists origin and destination, sender and recipient tax IDs, goods codes, descriptions, quantities and weights, vehicle and permit data and, for imported goods, the pedimento number. It must accompany the shipment, printed or digital, for the whole trip.

Freight without a valid Carta Porte risks fines and seizure. Because the Mexican carrier issues it, the details on your commercial invoice and packing list need to reach the partner carrier as well as the broker. We pass along the same counts and weights we confirmed when the load was built.

U.S. export filing and USMCA on southbound freight

Southbound freight to Mexico needs Electronic Export Information in the Automated Export System when the value of goods under any single Schedule B number exceeds $2,500, or when a license or other mandatory filing rule applies regardless of value. Mexico has no blanket exemption of the kind that applies to Canada.

For truck exports, 15 CFR 30.4 requires the filer to give the carrier the filing citation or exemption legend no later than one hour before the truck reaches the U.S. border. A truck that arrives without it waits, so we confirm the ITN is in hand before the load is tendered for the crossing.

The USMCA certification of origin is separate. It is needed only when the importer claims preferential treatment, it can be completed by the importer, exporter or producer, and it can appear on an invoice or any document containing the nine required data elements. Qualifying under USMCA rules of origin depends on how and where the goods were made, which the exporter and the Mexican broker confirm.

A southbound shipment from Long Beach to Mexico, step by step

1. 01
   Line up the brokers and the importer

   Confirm the Mexican importer of record and its agente aduanal, and who will file EEI on the U.S. side. Share consignee details, the commercial invoice and the packing list with both.

2. 02
   Build the load in Long Beach

   We pull the ocean container or pick up from your facility. If the goods arrived by sea, we can transload them into a 53' trailer, counting and weighing so the paperwork matches the freight.

3. 03
   Confirm the paperwork is ready

   The U.S. filer provides the ITN when EEI is required. The Mexican broker prepares the pedimento and confirms the shipment can be presented at Otay Mesa.

4. 04
   Move south to the San Diego border area

   The load travels the same corridor as our Los Angeles to San Diego lane, then continues to the partner carrier's yard near the Otay Mesa crossing.

5. 05
   Handoff to the transfer carrier

   The transfer carrier takes the trailer through U.S. export and Mexican import processing at the border.

6. 06
   Mexican leg and delivery

   A Mexican partner carrier, carrying the Carta Porte, delivers to the consignee. We relay status from the partner carriers until delivery is confirmed.

The Otay Mesa border crossing for commercial freight

Otay Mesa is the land port of entry on State Route 905 in San Diego, about 9 miles east of the San Ysidro crossing, facing the industrial Mesa de Otay district of Tijuana. GSA calls it California's busiest commercial truck crossing, and CBP has described it as one of the busiest cargo ports of entry in the nation.

GSA counted 958,766 cargo truck crossings there in fiscal 2019, carrying about $34 billion in imports. A GSA expansion completed in 2022 increased the commercial truck processing lanes from nine to 16. In 2019, Otay Mesa handled more than twice the truck volume of Calexico East, California's next-largest truck crossing.

For shippers in the Los Angeles basin, that means Mexico-bound freight moves on a short domestic run to the border and crosses where transfer carriers, customs brokers and border warehouses are concentrated. Crossing waits vary through the day and season, so the broker's readiness and the transfer carrier's appointment matter more than the clock time the truck leaves Long Beach.

Northbound trucking from Mexico into the U.S.

Northbound freight reverses the relay, with U.S. documentation added. The Mexican side records the export on a pedimento, the transfer carrier brings the trailer to the U.S. port, and the crossing carrier transmits an ACE e-manifest to CBP before arrival.

Under 19 CFR 123.92, CBP must receive the advance electronic truck cargo information no later than one hour, or 30 minutes for some shipments depending on the CBP-approved system used, before the truck reaches the first U.S. port of arrival. The carrier normally transmits it, and the importer or its customs broker may submit part of the data. The U.S. customs broker files the entry and claims USMCA preference when the goods qualify.

Once the freight has cleared, we can take it from the partner carrier's handoff and bring it to Long Beach for warehousing, cross-docking or onward full truckload and LTL delivery anywhere we serve.

Ocean imports bound for Mexico: moving in-bond

Some cargo arrives at Los Angeles or Long Beach already sold to a buyer in Mexico. That freight can move under a CBP in-bond instead of entering the U.S. and being exported, which avoids paying U.S. duty on goods that are only passing through.

Under 19 CFR 18.1, in-bond freight must reach the port of exportation within 30 days, and once there it generally must leave the U.S. within 15 days. We hold bonded carrier authority, so we can pull the container with bonded drayage and coordinate the Transportation and Exportation in-bond with your broker. Read more in our guide to in-bond shipments.

Checklist before tendering a load for trucking to Mexico

• Mexican importer of record confirmed and set up to import the goods.
• Agente aduanal appointed and able to clear at Otay Mesa.
• Commercial invoice with clear descriptions, values and terms of sale, sent to the Mexican broker.
• Packing list whose piece counts and weights match the freight.
• EEI filed and the ITN provided when a Schedule B line exceeds $2,500 or a license applies.
• USMCA certification of origin ready if preference will be claimed.
• Product permits or NOM compliance confirmed for regulated goods.
• Consignee address, receiving hours and contact for the Mexican partner carrier.

If any item is open, we hold the load in Long Beach rather than send it to wait at the border. If your Mexican customs broker needs a U.S. coordination contact, our page for customs brokers explains how we work together.

Frequently asked questions